I don't see much resale value in this one, honestly. But I'd be glad to be proved wrong and see you make a sale.
Most Americans aren't really aware of .US at all.
Basically, there are just too many options for buyers for the niche you're looking at. Before they'll look at TVShop.us, they'll try to buy domains from a list of other options:
TVShop.com
TVShop.net
TVStore.com
TVStore.net
TV.store
[Brandable1].com
[Brandable2].com
[Brandable3].com
[Brandable4].com
[Brandable5].com
etc.
You'll have to reduce your asking price a lot to be competitive, and most people will look for something else.