Wal-Mart wanted $30 for a 10 foot USB cable. I got the same cable down the road for $10 at Radio Shack. Wal-Mart should be cheaper due to larger bulk discounts

Wal-Mart wanted $30 for a 10 foot USB cable. I got the same cable down the road for $10 at Radio Shack. Wal-Mart should be cheaper due to larger bulk discounts and their famed logistics. A $20 difference can't be accounted for with a 6% sales tax. And it was still cheaper than online once I added shipping.