Product linking redirection and its affect on ranking

redirecting a product catalog from a site to another site via a script.

[Ride45]

We work with a wholesaler that has provided us with a copy of their product database. The DB contians more than 10,000 products. We have used this database to create our own internal product database.

Every product contains a link to a script on our server which maps the product id's on our server to a corresponding "buy page" on the wholesaler's server.

For example a product on our server if clicked would go to
www.mydomain.com/somescript?/productID=5

The script would then redirect to the user to a corresponding page on their server:
www.theirdomain.com/productID=5

We do this for 10,000 products (so there are 10,000 redirections).
---> They are not 301's
---> We have 30K+ pages indexed by google (many being our internal links to the script and then which redirect)
---> we have not been burned by it yet..

We're still on the 1st page of SERPS for competitive terms, but it's something that concerns me..
should we be changing our approach? Should each of the 10,000 outbound links be 301's? Should we not be using a script to redirect? Should we redirect to a framed page which exists within our domain, and then have the wholesaler's landing page be contained in a frame?
Any other thoughts?
THanks