There are many many types of karts. Like cars, there is an extensive list of brands. Here are a few: Comp-Kart, MGM, Iconic Edge, Birel, Emmick, Praga, Expirit, Kosmic, CRG, VLR, Intrepid, Tony Kart, Ital-Kart, Margay, Comp-kart, Invader, etc. The Bold brands are American-made.
There are specific chassis for different motor packages! Shifter karts require some extra hardware and features on the chassis. 2 cycle karts are usually a stiffer chassis, and 4 cycle chassis can be specific for a brand.
Kid karts are tiny karts! Jr-1 are cadet karts, and Jr-2 and older are full size karts.
Most vendors carry the consumable stuff, tires, spare parts etc.
Local to Reno
There are a couple resources in Reno for buying karts
Cole Nelson Racing: www.colenelsonracing.com firstname.lastname@example.org|209.631.5656 -Building American made Invader karts since 1974
Nevada Kartsport Racing Team: 775.219.4184 email@example.com -Birel Dealer for Reno NV
Cambrian: www.cambriangokarts.com|408.377.5278 -Birel, Rotax, ERC racing fuels, etc.
Leading Edge: firstname.lastname@example.org www.leadingedgemotorsports.com|209.369.0921 -Praga dealer
RLV: email@example.com|www.rlv.com|805.925.5461 -VLR dealer
Karting Concepts: kartingconcepts.com firstname.lastname@example.org|530.574.1898 -Comp Kart dealer
Swedetech: Swedetechracing.com email@example.com|916.687.3980 -Honda, Iame, Rotax engines
Fleming Racing Engines: flemingmotorsports.com Dougflemingmotorsports@gmail.com|818.891.5159 -Small engine rebuilding, blueprinting, restoration
Invader Racing Engines: firstname.lastname@example.org|775.313.3712 -LO206 vendor, builder