Yes but the ones that go up to 15V/1A are much more expensive than a single voltage supply.
Radio Shack are useless. It's time for you to find the real electronics shop in your town. Meanwhile, 15V is not an unusual voltage rating for laptop power supplies. I'd suggest that you do an ebay search for 15V, 15-v, 15-volts etc and see what turns up. WIth luck you'll find one for a few bucks.
/edit/ $35????? What a rip. Take that sucker back for a refund.
But yeah, I don't think your UMPC supply will hurt anything.
I doubt that the extra 1V will hurt, and the speakers will only draw as much current as they need. You should be fine until you find another.
Radio Shack are useless. It's time for you to find the real electronics shop in your town. Meanwhile, 15V is not an unusual voltage rating for laptop power supplies. I'd suggest that you do an ebay search for 15V, 15-v, 15-volts etc and see what turns up. WIth luck you'll find one for a few bucks.
/edit/ $35????? What a rip. Take that sucker back for a refund.
But yeah, I don't think your UMPC supply will hurt anything.