I bought them online from overstock.com. I had a 15% off coupon and they delivered and set-up the new beds and they also took away and disposed of the old ones at no charge.
They are both Serta Euro-top mattresses. One is a full size bed and the other is a queen sized bed. The cost for both of them after all was said and done was about $1100.00 which is not a bad deal for two new beds. I've had them for about 6 mos. now and they seem like a vast improvement over what I had.
I too suffer from a very bad spine/back due to having MS. I suffer greatly with pain and a good bed is critical when you have a bad spinal/back problem as I do.
Would highly recommend overstock.com for a bed but don't be too cheap. Buy something decent is my advice. I got a 10 year warranty on one of them and a 20 year warranty on the other one.
Best of luck! 
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