Here are some current rebate offers to get money back from the company for using their products.

Get up to $20 back on Castrol Motor Oil. Expires April 30, 1010
Purchase any Neutrogena Clinical product and receive $15 back. Expires April 30, 2010. For more savings print off a $5 coupon!
Purchase $20 of 3M or Post-it label [...]

Try a 20 oz bottle of X-14’s Foaming bathroom cleaner for FREE when you fill out this online form for a rebate check. You don’t even need to pay for a stamp! US residents.
Purchase any Pyrex metal bake ware by November 30, 2009 and receive $3 back by filling out this mail in rebate form [...]