Edit: Primarily I'm looking to buy online. Walmart, BestBuy and Tiger Direct exist down here. But they are a hike and a half from here.
Wait, Tiger Direct is a brick & mortar store?
I thought it was online only.
Anyway, I can't really help much, except to say that I bought this 128GB HP USB 3.0 thumbdrive
(for less than the current listing price) and it seems OK to me. I think I get at least/about 20MB/s write speeds, if not faster. But USB is still pretty slow in general. Large file transfers, such as filling the drive up or making backups, take a long time.
I bought it to use it as an external drive for my WiiU, but the WiiU partitions USB drives using a proprietary format, and something about this particular drive kept losing the formatting details or something. I kept losing all the data on it. Other USB thumbdrives drives I tested in the WiiU (8GB or smaller) didn't have a problem with keeping the data.
But it's been working perfectly--without data loss--when formatted using NTFS or other "standard" (exFat, ext4, etc.) formats.