Target and Wal-Mart go from 'matching' Amazon prices to undercutting them (bizjournals.com)

Prices, but what about selection?

Depends... I use Amazon primarily because I <3 prime and because Chicago has 11% sales tax. When buying something expensive, 11% adds a good bit. Brick and mortar can't take out sale tax, so for expensive purchases, amazon wins.

soo study included amazon 3rd parties or no? thats a huge detail article left out