Why buy?? Nothing but grief and headache, both buying and selling, rent only way to go, plenty of availability, affordability and locations, stay fluid and enjoy the variety!!
If your used to a normal European mattress, medium to soft, a Thai mattress, hard to rock hard, can take some getting used to and initially bring on excruciating back pain, get a memory foam topper, do some excercise, walking is always good, apply liberal amounts of Volteren and take some pain killers, not opiates!!