These sellers of ham radio equipment come recommended by SPARC members. If you want a broader sense of what is available, find a copy of QST Magazine which is always packed with advertisements.
Ham Radio Outlet
They have a well-stocked Burbank location.
A major patron of our hobby with an extensive catalog.
Main Trading Company
Known for selling surplus and used equipment.
UC Santa Cruz professor Ed Fong makes and sells well-regarded, affordable VHF/UHF antennas.
A U.S.-based seller of Chinese-made Baofeng equipment. A good option if you like the low price of Chinese radios but want the benefit of customer support.
A ham community site that lists equipment being sold by individuals.
Orange County-based manufacturer of lithium iron phosphate batteries, prized for their portability and long duty cycles.