This is going to hopefully be a brief talk on items generally sold on towny and what appears to be a going price as of right now. They are in no way the set prices for said items and they could fluctuate up and down as each month passes by.. i will break it up into sections for easier digestion and for those looking for specific things.
Keys are more common in game now as many players scramble to collect them for the crates, here are some general ideas of what they could sell for via shops or the auction house.
Survival - $750 - $2,000 : Commonly dropped via most monsters these keys have little worth.
MineCrax - $7500 - $15,000 : Drops by only a few mobs, these keys can also be obtained via /vote and fishing contests.
Enchantment - $5000 - $10,000 : Although only obtainable via the donor shop or the /warp drop event. The enchanted books these keys give are not always valuable.
Spawner - $20,000 - $50,000 : Like the Enchantment key it can only be donated for or won at /warp drops. The spawners within this crate could fetch you a loss at even $20,000 as chicken spawners are very very common.
Event Keys - $50,000 - $200,000 : These keys come around every event, changing from season to season. The crates prizes also change too. Hence the wide range in prices, Sometimes its possible to win the keys in the fishing contest, the /warp drops and also by donating for some.
Donation keys - $100,000 - $250,000 : These keys are ofcourse for one of the best crates ingame, They can be donated for, won by coming 1st in the fishing contest or very rare drops in the /warp drop event.
Now in this section i will list all spawners and their prices, i don't really need to go into detail so its not going to have reasons why..just trust me on the prices.
Chicken - $5,000 - $12,500, Cow - $20,000 - $30,000, Sheep - $20,000 - $30,000, Pig - $10,000 - $15,000
Rabbit - $75,000 - $100,000, Parrot - $75,000 - $125,000, MooShroom - $25,000 - $45,000,
Iron Golem - $450,000 - $750,000, Villager - $450,000 - $750,000
Spider - $25,000 -$35,000, Cave Spider - $12,500 - $20,000, Zombie - $25,000 - $30,000,
Zombie Pigman - $50,000 - $75,000, Skeleton - $30,000 - $45,000, Creeper $75,000 -$12,000
Slime - $15,000 - $25,000 (Only works within a slime chunk)
Magma Cube - $35,000 - $45,000, Shulker - $200,000 - $400,000, Enderman - $100,000 - $200,000
Witch - $80,000 - $160,000, Blaze $35,000 - $45,000.
I will add more spawners as they are added or i remember ones i have forgotten....
I will also be adding more items as i am requested to add them, but for now i am done typing XD.