Overstock.com has a lot of Books for Dummies choices (search "Dummies" in Books, then sort by price under $4) for only $3.83 with $1 shipping - $5 mail in rebate = FREE! Limit 2; exp 3/31 http://media.wiley.com/assets/354/22/rebate_form_2005.pdf

The form only asks for receipt, so I'm presuming you can mail in your online receipt before waiting for the book to arrive.

Or FREE Get Shipping on your whole Overstock.com if you order the Mr. Potato Head Activity Pack (search Potato Head) which is only $7.50 (reg. $29.99)!