I think the egg marketplace and the rancher shop should be made working exactly like the merchant shop. To see what's the lowest price when we have already added them. The egg market doesn't let's you see the price of the cheapest egg when typing the amount you want to sell it for. You must go and look every time. 

I think that may drive prices lower; but the layout would be nicer. It's currently hell to try to put a bunch up for sale at once