I am looking for a cheap GPS module with 3.3V to 5V supply, UART, SPI or I2C interface, can be used with UNO or other boards plus 5 to 8 dollars range. Erica

5 to 8 dollars range.

So, quality is not an issue?

yes. quality is not an issue

Check ebay - it has the lowest prices in general

The cheapest GPS units appear to be (supposedly) based on a UBLOX Neo-6M GPS chip. The floor price looks to be around US$11. Assuming the parts are not totally fake, the UBLOX parts support TTL level UART at 9600 and 3.3V.