Hi jjmethods,
There would likely be many other latex mattresses available to you that may be similar but the only way to know whether they felt similar to you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) would be based on your own personal testing and/or experience. You can read more about the Prana mattresses in post #3 here and this thread and I would be very cautious with these because they use thicker layers of polyfoam on top of the latex so you would be feeling polyfoam as much or more than the latex.
I would also make sure you’ve read the tutorial post here and also make sure that you don’t buy a mattress unless you know the specifics of all the layers inside it so you can identify any possible weak links in the mattress and make more meaningful comparisons with other mattresses.
If you let me know your city or zip code I’d be happy to let you know of any of the better options or possibilities I’m aware of in your area.
Phoenix