Hi Janie,
There are many memory foam mattresses that use higher quality/density memory foam in the same or lower budget ranges. The tutorial post (which is the first place I would start your research) includes links to many online sources that use higher quality materials and sell for lower prices that would have a much lower risk and if you let me know your city or zip code I’d be happy to let you know about any of the better options or possibilities I’m aware of in your area as well.
Phoenix