We got one 7 years ago from a place called Comfort King. I think they are regional, but it's the kind of place that makes the mattresses locally...not a brand name like Sealy, etc. We got pillow topped king size. I was amazed at how high it was when we got it
We had had a waterbed for several years, and although that is good for folks with allergies (like me), it's not so good for dh's back. He finally had it with a bout of soreness that we decided to get a new bed (he was a full time tile setter back then, and would get a shot of sciatica from time to time, bad news). We spent considerably more than 300 bucks, but it was worth it. If you have a place like this, try researching it along with the chain stores for comparison. You can add or subtract materials to suit your comfort level and the folks at this store were very helpful. I firmly believe this statement I read once, "You should pay for good shoes and a good bed, because your in either one or the other."