Don't laugh..but mine is from Wally World and it seems to work pretty good. They have 2 versions...one for like $68 and the one I bought for like $98. Both are made by the same company and the only difference between the two is the more 'spensive one has a usb cable to hook up to you 'puter with a cd included. I have never used this feature so cannot comment on its practicality. I've had it for like 1.5 to 2 years stuffed in the glove box and use it every now and then for my vehicles as well as buddies.