Bastion Press is having a sale on their Oathbound line. At $5 per book, it's a steal. The world of Oathbound bears much resemblance to Planescape, so if you're interested in 3.0/3.5 rules for a high-powered planar setting, grab it while it lasts.
http://www.bastionpress.com/Merchant2/merchant.mvc?Screen=PLST&Store_Cod...
(via ENWorld)
I really want that alchemy book, but i have to know how credible the company is.