Who doesn't love little surprises in their mailbox? I know our family sure does! I have a list of brands that our family uses a lot. Everything from what we eat to what we clean with. I try to email a couple of companies a week and inform them of how much I appreciate their products. I will then write down what day and to what company I wrote to, so I know not to write to them anytime soon. When/if they send me coupons in the mail I write it down so I know for future they are an excellent company. Now you're not guarunteed anything, some companies don't even give me a thank you response.
Me, personally, I have gotten some nice responses with coupons. Sometimes even FREE coupon items! Which is always the best! Try it!