We purchased a Casper online about 7 years ago and at that time it was really affordable. We love the mattress. I recently saw that Costco is carrying them now. It is about 1000 for a King, which compared to some of the stores we check out is very reasonable. As I said, we've had the mattress for about 7 years and it's still like new.
I purchased an Original Hybrid mattress from Casper a few months ago. I originally had a Tempurpedic mattress, but the memory foam does not hold up well and it turned into a saggy sponge with little contouring for my body. I had pressure point problems on my shoulder and had to get a super firm pillow to prop up my neck. All those problems are gone with my Casper mattress. No more pressure point problems in the shoulder or the hips. Plush but supportive and the pocket coils I know will last far longer than memory foam. Overall quite happy thus far.