It would be handy if when using the /shops find... GUI it also displayed the per item price. Take stone for example. Many players shops sell different amounts at different prices and it requires a bit of maths to work out which is actually cheapest. This would be simple if it displayed the per item price. So for the example below it would state $1.80 per stone.
Support-ish. I’d like to just be able to see if items are in stock or not first. Mental math on unit price is definitely secondary to that.
Same, I think it's a good idea, but it really isn't that hard to determine if say for example one shop sells 4 stacks of items at 460, and another shop sells one stack of items for sale 110 to work out which is cheaper. I'd much rather see the options of it showing how many remaining trades are available.
There could be a section in /preferences that lets the player choose to either sort by last used shops or lowest price.
That’s already been suggested. It’s not a matter of which you would rather, they can both be implemented. I’d rather a stack of 100 mobs dropped the loot of 100 mobs but that’s not related.