Just did a Home Depot Rebate (on free shipping--$50.00)... Waited 3 months or so, monitored the rebate company's website. Just sat at "approved"... Sent an email through the website, and less than a day later the check was in the mail... Bpppbbsss...
Now a days, everyone seems to take overpayments without a problem--phone, power, water, cable for my Mom are all pretty small... I just submit a ~4x payment and only have to cut checks once every 3-4 months. Makes bill paying a lot easier...
In fact, some companies if you ask their policy, they don't even consider accounts with less than $20 as due payable--they are willing to wait until the phone bill (example) is $20 or larger before they want payment... (I still don't let them get that big--but I have let bills of a few dollars ride a month). However, the local water company had a cow when a bill with a few dollars got misplaced one month.
-Bill