Monday MIRs are brought to you by Christina from Northern Cheapskate. Her passion is helping people take control of their finances through coupon-clipping, freebie-finding and frugal living strategies.

• Hanes. Buy 3 Hanes products and get a FREE Earth Day t-shirt. In addition, the Arbor Day Foundation will plant a tree (up to 20,000) on Hanes behalf. Offer is good from 4/01/10 through 5/15/10.

• ConAgra. Purchase $10 in participating ConAgra products and receive $25 in coupons by mail.  Offer ends 5/30/10.

• Filtrete. Receive a $4 rebate by mail when you purchase two Filtrete Air Filters with a 1000 Microparticle Performance Rating (MPR) or greater before 7/31/10.

• Spot Shot/Sony Pictures. Receive a $2 rebate by mail with purchase of Spot Shot and of one of the following select Sony Pictures Home Entertainment DVD’s: Pink Panther, Hook, Jumanji Collectors Edition, Daddy Day Care, Facing The Giants, Daddy Day Camp, Are We There Yet? or Are We Done Yet? before 7/31/10.

• Rayovac. Get $10 back by mail when you buy the Rayovac RoughNeck Flex360 and any pack of Rayovac alkaline batteries before 12/31/11.

• Colace. Get $5 back via mail-in rebate when you buy Colace Capsules or Peri-Colace Tablets before 12/31/10.

• Heartgard. Get $5 back by mail when you purchase a 12-pack of Heartgard for your pet at your veterinary office. (Vet clinic must fill out a portion of form.) Purchase must be made by 12/31/10.

If you’re new to mail-in-rebates, be sure to read Northern Cheapskate’s Simple Tips for Getting Rebates.

See the previous MIR roundups for more offers that are still available!