The LG UltraFine monitor lineup are the only ones that really work fully (including charging) the new MacBook Pros. For folks that don't have an existing monitor that can be adapted via USB-C to HDMI or Thunderbolt 3-to-Thunderbolt 2 (for Thunderbolt Display owners), this creates an opportunity for Best Buy to increase revenue per transaction as there is really no other viable USB Type-C competitors. Most are priced more than the LGs and don't have speakers/FaceTime camera and most importantly don't deliver enough power to charge the new MacBook Pros via the display (most seem to be maxing out around 45W). They are also lower resolution (in terms of both PPI, color gamut and resolution -- most are shooting for QHD versus 4k/5k).
It would seem like the gamble would be pretty low for Best Buy to carry these and at the very least they could start out online and make their ways into stores in the long term. In areas where there are no Apple Store (which there's 1/2 as many of as Best Buy stores) this is also an opportunity for Best Buy to attract new customers and get the jump on other large onliners that are going to aggressively try to bring these to their web stores soon (a certain photography and video store on the East coast immediately comes to mind).