trying to determine what I can do to fix my production site

I'm on a very old version of marketpress because the new one (3.0) broke my site due to it's lack of product categories being defined in the permalink/slug section .... so everyone of my urls were broken. I'm testing on another site of mine and now, I don't have the store base slug showing in the url either... my url is http://tristadeleon.com/scentsy/suri-seahorse , but it should be http://tristadeleon.com/buy/scentsy/suri-seahorse , again this is a test site as I'm trying to determine what I can do to fix my production site (scentswarmers.com)

The old setup I have is like this :

but after version 3, there is no product category url setting, which will destroy my site.. I'm not sure how other people got around this