There are numerous trail camera manufacturers out there. Some manufacturers concentrate on cheap models only, some manufacturers provide only high end cameras, and some manufacturers offer both inexpensive and expensive models.
Majority of trail cameras on the market today are manufactured in China, no matter who the manufacturer is. Most popular trail camera brands in affordable cameras group include Moultrie, Primos, Wildgame Innovations and Simmons. Also Bushnell offers some low cost models (but also more expensive ones).