The following manufactorers have sent me coupons by mail:
Giorgio - they sent me 2 free product coupons
Bigelow Teas - 1 coupon for a $1.00 off
Johnson and Johnson - 3 coupons for $1.00 off
International Delight Coffee Creamer - 1 coupon for $0.40 off (Says will only maile one coupon per household per year)
Johnsonville - 2 coupons for $1.00 off
Crisco - 2 coupons for $0.55 off
Martha White - coupon for free product up to $2.00
Sara Lee - 1 coupon for $1.00 off Sara Lee, Hillshire Farm, Jimmy Dean, Ball Park, State Fair, or Kahn's Product
Welch's - 3 coupons for $0.50 off
Webber - 2 coupons for $0.35 off either 1 seasoning or 2 marinades
Community Coffee - 1 coupon for free product up to $8.00

I e-mailed the companies and complimented them on their products and asked if they could send any coupons and this is what I've gotten back so far.