Before I even consider this is it straightforward? Rezzing an item for sale?

Take a display table (prim)

Inside the prim are the items for sale.

On the table are a row of other prim buttons.

Someone presses a button, the otem on the table de-rezzes, and the new item (from within the table prim) is rezzed on the table for the person to right click and buy if they want.

Is this quite basic stuff, or pretty advanced?

Pretty Basic.

I think Bloodlines sim does the same for the items they have for sale.

You click the button, the object rezzes, you buy the object.


Also...A system like this can be done easily with a modified rez-faux/rez-foo system.

There are a lot of systems out there that do that. For a long time, I used a free one in my shops that had that option, and was very pleased. You just rez a no mod/no copy object and then send it a llDie command when you want to rez a different object in its place. Use the rezzed objects as boxes from which you sell the actual copies to customers.

This should work for you.

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Be aware that in rezzing vendors the customer pays the vendor and not the rezzed object.

This is also how you sell products with customer-choice options. Write a system of llDialog Q&As so the customer can choose size, color, any other option your product might need. At the end your script tells them how much it will be and if they want it, your system will rez the object to their specs so they can buy it. Use a simple timer with an llDie statement to clear and reset the system for the next customer.