You can buy rapid HIV tests from various reputable retailers and manufacturers: Rapid Test - Clinical Info HIV.gov

Rapid HIV tests are diagnostic tools that provide results within minutes by detecting specific markers in the blood or oral fluid. While they offer privacy and convenience, their effectiveness depends heavily on the "window period"—the time between exposure and when the virus becomes detectable. Core Functionality and Accuracy

: These look for both antibodies and the p24 antigen (a protein from the virus itself). These can detect HIV as early as 2 to 4 weeks after exposure.