Can someone enlighten me as to where is the best place to purchase the one piece RRA scope mount? Thank you.

Try Pete-in-NH.  He is a RRA dealer and has a forum in the Industry Forums section called 'Legal Transfers'.  He also has ads in the equipment exchange.

Just for the record, it's not actually a Rock River product.  J&T Distributing shows exactly the same mount in their catalog, and I just bought one from them at the Eastman Show here in Atlanta over the weekend.  J&T's catalog price is a bit higher than RR's, but they sold it to me at the same money I would have paid for the RR unit.  Yes, I'd check with Pete in NH if you're looking to go mailorder.

By the way, it seems to be a good, sturdy product. I'll be doing a short range, sighting in, shoot at a local indoor range tomorrow.  If I have any problems, I'll repost on this thread.

www.armsmounts.com