I've put together this list of all currently available upgrades. It covers individual costs, total costs, space added per upgrade, and space added total.

At a glance:

• Mining- 3 upgrades costing 175 Moonstones.

• Cooking- 3 upgrades costing 175 Moonstones.

• Nests- 2 upgrades costing 75 Moonstones.

• Wardrobe- 11 upgrades costing 660 Moonstones.

• Dens- 9 upgrades costing 450 Moonstones.

•Den Slots- 40 upgrades per den costing 820,000 Pebbles. 400 upgrades total for all 10 dens costing 8,200,000 Pebbles.

•Total to buy everything 1535 Moonstones and 8,200,000 Pebbles (8.2mp).

Mining
--------------------------
Starts with 15 slots.

1. Costs 25 Moonstones,
adds 5 Slots, for 20 slots total.

2. Costs 50 Moonstones,
adds 5 Slots, for 25 slots total.

3. Costs 100 Moonstones,
adds 5 Slots, for 30 slots total.

Grand total of 175 Moonstones with 30 slots for the max.

Cooking
------------------------------
Starts with 12 slots.

1. Costs 25 Moonstones,
adds 4 slots, for 16 slots total.

2. Costs 50 Moonstones,
adds 4 Slots, for 20 slots total.

3. Costs 100 Moonstones,
adds 4 Slots, for 24 slots total.

Grand total of 175 Moonstones with 24 slots for the max.

Wardrobe
-------------------------------
Starts with 5 slots.

1. Costs 10 Moonstones,
adds 1 slot, for 6 slots total.

2. Costs 20 Moonstones,
adds 1 slot, for 7 slots total.

3. Costs 30 Moonstones,
adds 1 slot, for 8 slots total.

4. Costs 40 Moonstones,
adds 1 slot, for 9 slots total.

5. Costs 50 Moonstones,
adds 1 slot, for 10 slots total.

6. Costs 60 Moonstones,
adds 1 slot, for 11 slots total.

7. Costs 70 Moonstones,
adds 1 slot, for 12 slots total.

8. Costs 80 Moonstones,
adds 1 slot, for 13 slots total.

9. Costs 90 Moonstones,
adds 1 slot, for 14 slots total.

10. Costs 100 Moonstones,
adds 1 slot, for 15 slots total.

11. Costs 110 Moonstones,
adds 1 slot, for 16 slots total.

Grand total of 660 Moonstones with 16 slots for the max.

Dens
----------------
Starts with 1 den.

1. Costs 10 Moonstones,
adds 1 den, for 2 dens total.

2. Costs 20 Moonstones,
adds 1 den, for 3 dens total.

3. Costs 30 Moonstones,
adds 1 den, for 4 dens total.

4. Costs 40 Moonstones,
adds 1 den, for 5 dens total.

5. Costs 50 Moonstones,
adds 1 den, for 6 dens total.

6. Costs 60 Moonstones,
adds 1 den, for 7 dens total.

7. Costs 70 Moonstones,
adds 1 den, for 8 dens total.

8. Costs 80 Moonstones,
adds 1 den, for 9 dens total.

9. Costs 90 Moonstones,
adds 1 den, for 10 dens total.

Grand total of 450 Moonstones with 10 dens as the max.

Den Slots
--------------------
Starts with 10 slots.

1. Costs 1,000 Pebbles,
adds 1 slot, for 11 slots total.

2. Costs 2,000 Pebbles,
adds 1 slot, for 12 slots total.

3. Costs 3,000 Pebbles,
adds 1 slot, for 13 slots total.

4. Costs 4,000 Pebbles,
adds 1 slot, for 14 slots total.

5. Costs 5,000 Pebbles,
adds 1 slot, for 15 slots total.

6. Costs 6,000 Pebbles,
adds 1 slot, for 16 slots total.

7. Costs 7,000 Pebbles,
adds 1 slot, for 17 slots total.

8. Costs 8,000 Pebbles,
adds 1 slot, for 18 slots total.

9. Costs 9,000 Pebbles,
adds 1 slot, for 19 slots total.

10. Costs 10,000 Pebbles,
adds 1 slot, for 20 slots total.

11. Costs 11,000 Pebbles,
adds 1 slot, for 21 slots total.

12. Costs 12,000 Pebbles,
adds 1 slot, for 22 slots total.

13. Costs 13,000 Pebbles,
adds 1 slot, for 23 slots total.

14. Costs 14,000 Pebbles,
adds 1 slot, for 24 slots total.

15. Costs 15,000 Pebbles,
adds 1 slot, for 25 slots total.

16. Costs 16,000 Pebbles,
adds 1 slot, for 26 slots total.

17. Costs 17,000 Pebbles,
adds 1 slot, for 27 slots total.

18. Costs 18,000 Pebbles,
adds 1 slot, for 28 slots total.

19. Costs 19,000 Pebbles,
adds 1 slot, for 29 slots total.

20. Costs 20,000 Pebbles,
adds 1 slot, for 30 slots total.

21. Costs 21,000 Pebbles,
adds 1 slot, for 31 slots total.

22. Costs 22,000 Pebbles,
adds 1 slot, for 32 slots total.

23. Costs 23,000 Pebbles,
adds 1 slot, for 33 slots total.

24. Costs 24,000 Pebbles,
adds 1 slot, for 34 slots total.

25. Costs 25,000 Pebbles,
adds 1 slot, for 35 slots total.

26. Costs 26,000 Pebbles,
adds 1 slot, for 36 slots total.

27. Costs 27,000 Pebbles,
adds 1 slot, for 37 slots total.

28. Costs 28,000 Pebbles,
adds 1 slot, for 38 slots total.

29. Costs 29,000 Pebbles,
adds 1 slot, for 39 slots total.

30. Costs 30,000 Pebbles,
adds 1 slot, for 40 slots total.

31. Costs 31,000 Pebbles,
adds 1 slot, for 41 slots total.

32. Costs 32,000 Pebbles,
adds 1 slot, for 42 slots total.

33. Costs 33,000 Pebbles,
adds 1 slot, for 43 slots total.

34. Costs 34,000 Pebbles,
adds 1 slot, for 44 slots total.

35. Costs 35,000 Pebbles,
adds 1 slot, for 45 slots total.

36. Costs 36,000 Pebbles,
adds 1 slot, for 46 slots total.

37. Costs 37,000 Pebbles,
adds 1 slot, for 47 slots total.

38. Costs 38,000 Pebbles,
adds 1 slot, for 48 slots total.

39. Costs 39,000 Pebbles,
adds 1 slot, for 49 slots total.

40. Costs 40,000 Pebbles,
adds 1 slot, for 50 slots total.

Grand total of 820,000 Pebbles with 50 slots as the max per den.

Grand total for all 10 dens 8,200,000 Pebbles with 500 slots as the max.

Nests
-------------------------
Starts with 3 nests.

1. Costs 25 Moonstones,
adds 1 nest, for 4 nests total.

2. Costs 50 Moonstones,
adds 1 nest, for 5 nests total.

Grand total of 75 Moonstones with 5 nests as the max.

Just bumping this so not people can see