I have found the prices at 707 to be at the higher end of the price range. However, Levi usually has a pretty good selection of cards. I imagine if you go direct to his web, he will negotiate, but not sure.
I just posted this in another thread that
www.cardtarget.com has a section devoted to tracking 1952 Topps sales. Disclaimer - I have no affiliation with the web site or owners.
All the Best,
Z Wheat