The title is a bit misleading...the 10% off coupon can't be used online, it's just available online, and has been for some time...although the OP's effort is appreciated, to inform those that my otherwise not have known about it.
To get it, I always do a temporary change of address (using a family member's address)...you do need a valid debit/credit card for verification (and it charges you $1.05). After entering your debit/credit info and submitting, you'll have the option to print the 10% off Best Buy coupon (among others). Most say exit afterwards, but I always CONFIRM the change of address, write down the confirmation number, then immediately google "cancel usps change of address". Enter your confirmation number, cancel the change of address, and you're done.
* There are ways around the $1.05 charge, but it's more work than it's worth IMO, and you still need to have a valid debit/credit card.
* I go through with the confirmation then cancel, as the first time I never actually confirmed yet it temporarily changed my address anyways...typical government website...so now I always confirm, then cancel and I haven't had a problem since.
* For those hesitant of entering such personal information via a link...simply google USPS mover's guide, and it will be one of the first links.
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