I'd skip buying two pairs and buy one pair that comes with a day and night lense.
Smith and spy come with two lenses. Most if not all oakleys do not come with 2 lenses. You can't go wrong if you stick to the bigger brands. (oakley, smith, spy, electrik, anon)
You get a much better deal buying a 100$ pair of goggles with 2 lenses than buying two pairs of 50$ goggles. Cheap goggles have cheap lenses prone to fogging / vision distortion / damage. It just feels so much better looking through a quality lense. (If something like chromapop or happy lens is in your budget I highly recommend it)