For one item, $180 for a copy of the Planes of Conflict boxed set from Planescape. I thought it was a bargain, having seen it for much more on eBay.
The listing from the seller was Mint condition, but I didn't really understand. It came in the original shrink wrap.
I'll never sell it, yet months after receiving it, I find I cannot remove the shrink wrap. Is that whacked or what?
EDIT-----
The largest single purchase, including the above, was around $850 or so dollars earlier this year, spent for a large variety (16+ books) of old Traveller (various), Planescape, Dark Sun, and other miscellaneous items I had wanted back in the day but missed out on due to lack of funds. At the time I was feeling I had the money to spare, so I did. Plenty of reading material for me. Plenty of nostalgia to review.