Questions

Our current selling system is based on Products, ie. repeatable items which you link to an Image.

For one-off items, for example, original artwork, we are considering setting up a bidding system, or a one-off price facility.
But, before we do that, you can easily use the current system to sell individual items, here is how:
-1- set up price bands for your originals, say A =100, B = 300, C = 1000
-2- enter those price bands as Products, they can be named the same, the system works by the Product ID, not name, example: Original A - is a Product with an ID of 234
-3- enter the relevant price band ID into Product field of the relevant Image, example: you want to sell a drawing for 100, enter 234 into Product field of that image ( this is done in NUZ > Publish > Images > click the Image to edit )