Where can I find the cheapest gps?
Craigslist..... Just make sure you have a friend with you. Make sure you bargain. Compare the prices online before making an offer.Meet during the day, in a public place. i.e Starbucks or INSIDE a shopping mall (NOT in the parking lot)
Probably Wal-Mart or EBay.
You get what you pay for !!!
If you have a smart phone or iPhone/Pad there are oodles of free navigation apps. Purchase a decent phone mount for your vehicle and bring a car charger and you're set.
I spent a lot of time looking for the best quality and prices. But finally decided the best choice is still there http://tinyurl.com/d2ot3xx