Buff the prices the server buys mob drops for (and adjust some as more appropriate to rarity)

Rotten Flesh (16) for $4
Bones (16) for $16 -- Bones are some of the most useful utility for beginning islands; I do not expect anyone to sell them for 1 per either tbh
Gunpowder (16) for $16 -- Gunpowder is less useful than bones, and no more rare. It should not be more valuable in the shop.
String (16) for $10 seems about right
Spider Eyes (16) for $10 seems about right (This is since killing spiders can get you two sell-able drops)
Enderpearls (4) for $80 -- Without the end, grinding endermen is nigh impossible; so the pay should reflect this. 20/pearl should be min. Look for further buffs
Slimeball (1) for $20 -- The price seemed fair where it was at before. Having a slime chunk is rare. And if someone is willing to suffer with swamp biome to grind slime, then they deserve the money because those fuckers are so annoying.
Shards (1) Buy: 4 Sell 1 -- Shards are only used for crafting, and the normal block prices seem to be about 12-20 per block. Decreasing buy to 4 would make this match the blocks shop more appropriately. Also, grinding shards is impossible without guardian temples; so why make these sell-able?
Blaze rod (1) for $5 -- No blaze spawners currently; so spawn rate is low and difficult to grind.
Magma Cream (1) for $25 -- These are slightly more difficult to grind than slime, and can be crafted from slime (with blaze powder); so it should be a little more valuable.
Ghast Tear (1) for $100 -- Very difficult to gather, requires tons of setup, and drops are so low. This is one of the more rare drops; price should reflect it.
Ink Sac (1) for $20 -- Grinders for this are tedious to set up, not very efficient, and not easy to collect by hand (meaning you have to spend the 5+ hours making the farm for it). Pay should better reflect the difficulty to acquire.
Feathers (16) for $8 -- I don't want to promote people breeding chickens for lag purposes; so leaving the payout for this underpriced compared to other mob drops would dissuade a laggy practice.
Eggs (16) for $8 -- Ditto ^

Money is difficult to come by in skyblock, and buffing these prices (which is not even to absurd rates) would promote people investing the effort into making farms. Which is more time spent on the server :)