Amazon.com and Jack's Small Engines sell carburetor kits for Briggs & Stratton engines, as of 2015. Typically, Briggs & Stratton carburetor kits are also available from many sellers on eBay.com, but available products depend on current listings.
Jack's Small Engines has dozens of different carburetor rebuild kits available to fit almost any Briggs & Stratton engine. The company stocks kits for all of the manufacturers' modern engines and many vintage engine models as well.
Amazon.com stocks the Briggs & Stratton 498260 carburetor overhaul kit, which works for many models of the company's engines. The kit includes various gaskets, seals, washers, needle valves and other parts needed for a carburetor rebuild.