So, I just ordered a lot of 8 Goosebumps books on eBay for $29. That's a pretty hefty fee for only 8 books. However, it included some gems, so I just had to buy it. However, after I purchased it, more Goosebumps listings appeared at the bottom of the page. That's normal. But something caught my eye. A lot of 8 Goosebumps books for only $9.95. Free shipping too!
It includes books I don't own. Welcome to Camp Nightmare (original AND reprint), Planet of the Lawn Gnomes, Son of Slappy, Night of the Living Dummy 2 (Classic Goosebumps), Creature Teacher, and behold: the limited edition pre-Classic Goosebumps Welcome to Dead House. Now, I don't know if it still has the poster or not (lister didn't say), and there's a sticker on the front. But still, that's a pretty rare book! I'd say that edition of the book with poster is worth $7+. Without poster, I'd say $5+. So I think that, plus the other books (in acceptable condition) is well worth the $10.
Here's the listing if anyone's interested: http://www.ebay.com/itm/Lot-of-8-Goosebumps-books/152499394811?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D40130%26meid%3Dd2f736375dc74bef8a99b77a7cf26ddf%26pid%3D100011%26rk%3D6%26rkt%3D12%26sd%3D352014425640
(only ships to US)