Osmocote Outdoor & Indoor plant food!
Just buy Osmocote Outdoor & Indoor Plant Food 3 lb. from a local retailer (it's on sale at Lowe's for just $9.97 through 5/23!) and then submit for the $10 mail-in rebate here.
You'll need to send in your receipt and the rebate form to:
3 lb. Osmocote® Outdoor & Indoor Plant Food
PO Box 540028
El Paso, TX 88554-0028
Valid through June 30, 2011. Rebate requests must be postmarked by July 30, 2011 and received by August 12, 2011. Allow 10-12 weeks after mailing for receipt of your rebate check. To check the status of your rebate submission, visit www.scottsrebates.com or call 1-866-324-3482.
(Thanks, Who Said Nothing in Life is Free! and Hip2save)