is there anyway you can tell how much the items in a specific shop/gallery are worth?

If you have a gold account, which I see you currently do, each item in your shop will have the "lowest price" listed under the price amount. You can also use the autopricer.

Beyond that, if you hover over an item, it will tell you the "official price" (what an item sells for in NPC shops) and "recent price" (what it has been selling for in user shops lately).

i know about that. i meant a link that tells you how much a shop is worth. like a full total price for all items

No, I don't think there's a way to know that, unfortunately.

There used to be a way to find out what all items on your account are worth, which is perhaps the closest to what you want, but it was cancelled some years ago due to the strain it put on the system.

there is one way, but its a lot of work and the value is only an estimate.

Make a checklist at SubetaLodge.org, mass add your shop items to the checklist, then choose to display "Items you have" then look at the value that says "Estimated value of items in user shops:"

Depending on the size of the shop, this could be done fairly quickly, but you need to do a mass add for each page in each category of your shop/gallery.