From my shop how do I find the shop with the lowest price

the only way if you don't have a Gold Account is to manually search for each items in user shops

Thank You

items in your shop also show an information box if you hover over them. The data in this box is on a cache delay, but it's easier than doing a search. If you do a search you get more information on how many people are charging that particular low price. It could be an outlier.

Anything below around 5KsP is going to be hard to sell. Just being lowest may not sell it for you unless you sit on the item and change the price repeatedly because there will always be someone with autopricing. I fragmentize these items if they don't sell quickly myself, ymmv.