Retail Locations Count:
Total of 10,249

Best Buy: 1400 Locations Nationwide
https://corporate.bestbuy.com/about-best-buy/
"Nationwide, Best Buy has more than 1,400 stores and locations, including large-format and Best Buy Mobile stores, and employs more than 125,000 people."

Sam's Club: 632
https://en.wikipedia.org/wiki/Sam's_Club
"Number of locations 632 (U.S.) (FY 2014)[1] 38 (international)"
The number of locations has increased to 650 locations for 2015. 2014 is only for source references.

Fry's: 34 Locations
http://www.frys.com/ac/storeinfo/storelocator...csfooter_D

Target: 1,795 stores in the United States
http://pressroom.target.com/corporate
"Target has: 1,795 stores in the United States"

Walmart: 4,562 Locations
http://corporate.walmart.com/our-story/our-bu...locations/
Walmart U.S. 4,562

Sears: 926 locations.
https://en.wikipedia.org/wiki/Sears
"There are 926 full-size Sears stores in the United States."

HH Gregg: 228 locations
http://www.hhgregg-jobs.com/about-us.html
"h.h.gregg operates 228 stores in Alabama, Delaware, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Maryland, Mississippi, Missouri, New Jersey, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Virginia, West Virginia and Wisconsin."

Costco: 672 locations
http://phx.corporate-ir.net/phoenix.zhtml?c=8...omeprofile
"Number of warehouses: 672 (as of 04/15/15)"