pine rivet
ladders is a very useful item in eggwars. and only being able to buy 8 ladders at a time is quite annoying. so my suggestion is more of a QOL.
8x iron = 8x ladder
32x iron = 32x ladder
64x iron = 64x ladder
something like this would be better i think. and even just adding the 32x ladders option would be fine too for less ladder options. it doesn't have to be specifically these values.