http://www.pythons.com/hamper - This is where I got my little guy no problems thus far (had since March)
http://www.lllreptile.com

not sure how much these next two are - these are top of the line though

http://www.snakekeeper.com
http://www.newenglandreptile.com

dar I know there are some members here with some great sites - just can't recall the URL's off the top of my head!