Yes, they do sell camping accessories. They also sell a lot of other goods that have to do with being active. Sports Authority specializes in sports, but also most likely meet your camping needs.
Some of the companies in the Miami area that sell camping and sporting goods are Bass Pro Shops, Sports Authority, Dicks Sporting Goods and Sports Chalet.
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Most sporting goods stores will sell accessories for runners. REI, Dick's, and the Sports Authority all have a wide selection of products, both in store and on their websites.
I have seen them near the checkout at Sports Authority.
The Camping World company website offers many trailer hitch accessories and so does the company Canadian Tire from their website. The Cabelas company website also offers a range of accessories.
Stores that sell camping supplies include Dick's Sporting Goods, and Sports Authority. These are nationwide stores that deal with a large array of sporting goods. More specific stores would include the likes of Cabela's Outdoor.
Sports Authority
Dicks sports authority and footlocker
No only at Walmart
It is difficult to judge which brand has the best sports accessories since there is such a wide variety of sports and sports accessories. Also, what someone judges as the best in a particular accessory may be associated with a preference for the particular way that person plays. Most big name sports companies, such as Nike or Adidas, do sell good quality accessories.
Sports Authority does sell all sorts of treadmills ranging from all kinds of prices. The smaller ones have less to them than the bigger ones that cost more.
The Outdoor Megastore, which is located in the UK, does sell ski apparel, accessories and equipment. It also specializes in camping, hiking and cycling equipment.