I am currently seeking a reseller providing discounted Interworx licenses for VPS testing use. I know that Interworx has a limited license available, however, I need it for more than a single domain, so this option is out :).

If anyone knows of a licensed reseller and could point them out to me, that would be great!

I know they have a listing on site, however, it appears most of them are web hosting providers and do not directly resell the licenses.

http://www.interworx.com/partners does have a good list to choose from. I know that Karl from Steadfast.net could probably give you a fair price for a license of Interworx.