These $13 modules are hard to beat. I'm not sure if these are fake Ublox modules or genuine custom branded modules, but they work great either way. I've been using them in a few different projects lately because they are 3.3V compatible, have a PPS pin, have USB and UART, and are very sensitive. I saw that they continued to pursue even without the antenna connected. The included header makes it easy to solder into a project.
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