There are several manufacturers and you can even buy them online used well, if you shop around a bit. One thing I would recommend is to get one that is waterproof, because you never know what you might be using it for. There are many that are used by hikers, mountain bikers and folks that do back-packing or mountain climbing. These units are not usually water proofed, so you need to also consider that.
Another thing that is very important is to check on the battery life. Some of these units only last for 12 hours without recharging, but if you're going to be in the mountains for a number of days then you need to either bring extra battery packs or find one that has a battery life of 4 to 5 days. There are not that many that are like this, and the ones that are run well for 4-5 days are over $1000.
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