Hi Rangerhouse,
Since you're willing to buy comics to scan, have you noticed the auctions from Lonestar Comics (mycomicshop) There's a new one starting this weekend.
I monitored the first two and there were a lot of low graded comics. A comic graded good by Lonestar is not too bad. I've bought a few with this grade.
The bidding is ususally below guide and the buyer's premium is low compared to Heritage. I'll be checking it out myself.