Best Buy has the US Postal Service pitching ads for them, via a monthly online coupon for 10% off Best Buy stuff. This article from CyberNet news lists the items to which the 10% discount applies (although one commenter notes the staff probably won’t check the coupon details), and describes how to manipulate the URL from month to month, so you can effectively get yourself a coupon any time you want to, that is, until BB and USPS figure out what people are doing.

Here’s the latest coupon, which expires May 31st:

https://moversguide.usps.com/img/coupon/bestbuy/200804_clientarea.gif

And the previous one, good until April 30th:

https://moversguide.usps.com/img/coupon/bestbuy/200803_clientarea.gif

 Via Lifehacker.