I feel compelled to add to this thread that I have had many perfect internet transactions with the following:
H & R Magic Books, Humble, TX http://www.magicbookshop.com
The Magic Warehouse, Reiserstown, MD http://www.themagicwarehouse.com
Both will confirm if they have an item in stock BEFORE you order it, and hold it pending your order/payment.
After a (very rare) shipping mixup, H & R paid return shipping for the incorrect items from both
customers, and rectified the situation with corrected shipments immediately. My other transactions in buying/selling/trading used books with them have gone flawlessly.
Magic Warehouse will even take your order online with the option of your mailing a check or money order to follow!
Both have reasonable shipping charges. Both ship quickly and safely, and all goods have arrived in perfect shape and as advertised.
I recommend these online dealers for your inspection. I have nothing but good things to say about them.