The Treehouse is open! Next vaca is probably January. All books $10+ have front/back scans. Minimum order is $15 and one copy limit on hot books. Checkout is via Paypal. It's more work, but I can also send invoices through Stripe, in which case just email me a list of books with preferred shipping. Send all emails to firstname.lastname@example.org.
Update 11/19 - Site was down for a few days but we're back. Seems like every time there's a server update it screws me up. At some point I will start again from scratch, new hosting co, new software, new payment system, etc, just need a big chunk of time. SO, if the site goes down again, save your bookmark, I may just pull the plug on the old site & start a new one.