I got a firm foam mattress from Ikea and love it. Serta might be one of the names you were looking for...
................Ikea mattresses are not only mediocre, they are expensive as well (the better ones), and the size is a little off. If your bed is not an ikea bed, you will have a lot of space left plus only the ikea bedding fits well.
Maybe it depends on the size. I bought a king size bed in Ilumel and was checking the mattresses of ikea, and they were shorter than the American king size mattresses. The one I bought fits perfectly.I find that to be not true. I have a mattress from IKEA and the bed from a different store. Mattress fits fine and the sheets I bought online and not from IKEA are a perfect fit. Mattress is extremely comfortable. The price? A little high, but everything in IKEA is priced high when you compare it to USA prices.
Maybe you were comparing an Eastern King to a California King?Maybe it depends on the size. I bought a king size bed in Ilumel and was checking the mattresses of ikea, and they were shorter than the American king size mattresses. The one I bought fits perfectly.
This time for another bed I want to buy somewhere else than IKEA... (and if possible in Higuey).