Ill buy your lysander head

lol, I like that lying to yourself part

dude, up your price of the elytra for 4db or more
shulker boxes sell at 1 db usually so I would say 3-4 diamonds per shell
and I would say dragon heads should be the same price as the elytra cause both of them are equally hard to get.
your prices are kinda low, you will attract a bunch of people with your offer but you can still make some extra diamonds without losing buyers

I got a mineseyecraft head for free lel, that's what happens when you and the shop owner are good buddies