Mine cost $350 for a 6.5ft bed and tailgate. Line-x is without doubt the best of the bunch and they also have a process called xtra that can be applied to the line-x. They will also even colour match to your paintwork. Rhino liner is pretty close but dont have the nice finish of the line-x.
If you are having problems with it pealing then the dealer has not cleaned the bed properly before applying the liner and this is covered under the lifetime warrenty.
Also beaware that the line-x liner is a high pressure system and some rhino liner are also high pressure but most are low pressure. You def want the high pressure system as it applys the liner many times better and drys to the touch in seconds.