I have some auctions on eBay right now that I thought people here might be interested in. Links below. The first three auctions are for sets of lectures most of which are still available as MP3s through the ARI e-Store but some which are not. The second three auctions are for older publications that are pretty hard to find. Note that some of the auctions will go live at 6:30 PST today, so the links may not work until then.
Not listed on eBay: I also have original LPs of Basic Principles of Objectivism by Nathaniel Branden and Principles of Efficient Thinking by Barbara Branden, published by the Nathaniel Branden Institute back when they were still working with Rand. The Basic Principles set seems to be in decent condition, though I haven't looked at every single record recently. It's missing the first volume but is otherwise complete. The Efficient Thinking set is a weird one. I have two copies of volumes 1 and 4-10, and one copy each of 2-3 -- so a complete set and then another that's 80% complete. Of the duplicates, one each of volumes 4-10 are still sealed in the original shrink-wrap, which I imagine is pretty rare at this point. If anyone's interested in those, feel free to respond on here. If you're in the Orange County, CA area, you can pick them up in person and save on shipping.
I wasn't sure how to price these, so I erred on the side of higher prices for this auction and will relist if they don't sell.