Coleman used to sell direct. Their web site is
http://www.coleman.com. I love my piezo start model, but those little spark strikers for starting stoves work quite well on the regular model.
Most of my camping equipment I now get from the Redhead, a division of BassPro. I used to get a lot from Cabela's but they got so lousy with out-of-stock and backorder status, I finally gave up. I was lucky to get ½ of any given order on time. Customer service has gone right down the tubes. When you complained about it, it was always somebody else's fault -- supplier, warehouse, UPS. And God forbid they would actually discount or substitute something else so you didn't have to do without. Redhead & Cabela's catalogs are very similar and both carry the same lines at the same prices.
Redhead is pretty much an upper scale retail store, but they have a web site
http://www.basspro.com/ and massive catalogs covering everything. So far, their shipping record has been vastly superior to Cabela's and cutsomer service has been a lot more interested in solving problems than telling me what "their policy is." Plus you can get right to management, whereas Cabela's management won't return calls.
Warning: Do your business with Bass Pro/Redhead by phone and never give them your email. They will spam you to death and refuse to stop, even after formal written notice. It has reached the point it is so bad, we are taking legal action. So far the attitude of the lawyers is 'screw you, sue us.' They finally quit after the Attorney General stepped in!
For tents, backpacks and related items, it's hard to beat Eureka, the premium US maker. Their web site is
http://www.eurekacampingctr.com/ -- at least the factory outlet store in Binghamton, NY. Whenever I'm passing that way, I make it a point to detour in for "factory seconds" shopping.
Campmor, in NJ is also a pretty big mail-order firm, and does discount a little, but their catalog is tough to read and figure out what the quality level is.
I don't generally recommend Camper World. They do have many useful items but are geared predominantly for the 3 BR, bath-&-a-half crowd. Prices are high unless on sale and I'm not a fan of their marketing gimmick "President's Club" -- to me just another excuse to charge you to reduce prices back to normal market anyway. They have a web site but it is a nightmare to navigate, especially if you have your security settings require authorization for permanent cookies. It won't take no for an answer and just keeps trying again & again, dozens of times in a simple catalog check.