Redstone Category: Pistons, repeaters, observers, those kinds of things Item count selector: So instead of buying several batches of 16 of an item, A mechanic for selecting the amount you would like to buy. So a person could select "256" and get 4 stacks of something, etc.
I like this idea although when people want to make Farms i think it would ruin the fun because you would be able to just buy the observers and pistons.
Doubting the idea of adding a whole redstone store or adding redstone as items you can buy, i really do like the item count selector - we'll look into it.