There are many GPS devices that got price cuts or will get price cuts during Black Friday period. Here is a short list of devices offered at substantial discounts.
Here is a list of GPS devices offered in one of the major consumer electornics store in the USA. These GPS navigation systems are all under $100 range which is about 50% to 60% off their original price.
TomTom XL 300s bundle
Garmin Nuvi 255wt
Garmin Nuvi 205W