Thank you Mr Camping World.
I cannot imagine that somebody, somewhere is not able to sell the same product as Camping World for less. We were members for 2 years, then gave up. Anything we bought, we could always get cheaper elsewhere.
Thanks to their "good customer service", I went in search of mattress toppers on the Net.
As a result, I found a cheaper mattress manufacterer. I was going to order from Knox Foam, who has a very good price. I found Lindsley Foam in MS, looks like a no frill outfit too. They will make custom cushions, but they advise you to just buy the blocks of foam and they'll tell you how to cut them.
If you do not have them yet, here are those 2 addresses for custom mattresses, cushions,...... :
Lindsey Foam and
Knox Foam (mattresses cover too)
Memory foam pads are available everywhere. Is my search over? Maybe. Google promised me 8,360 results. I was ready to go...... they gave me only 281.
I am glad to say that after only a few hours of research

(less than 7 hours), I found what may be better prices than CW. Could be worth checking if you are in the market for memory foam mattress pads. (I have not ordered from any of those outfits):
Smart Bargains: $49.99, plus $6.95 shipping (total order). They tell me the pads are 1 1/2 or 2" thick. (on the picture,they look more like 1")
So: thickness total 2" or 4", 10 years warranty, 60 X 80. I can use 2 anyway, so I will pay $106.93
Camping World: 2" thick , 1 year warranty, 53 X 74 . With the tax, I pay $104.91
The size I need is 49 X 74, which leaves me 2 strips 11 X 6 to put under the pillows. In the end, better warranty, maybe thicker pad, for $2.02 xtra.
an other one:
Home Shopping Network. No idea how thick (could be only 1"):
deducting coupon # 148701: ($15 off good through May 31, 2003), final cost , incl. shipping $63.80 for full size bed, or add $1 for queen. 5 years warranty.
A few things I found on the way: Bed, Bath & Beyond and JC Penney were mentioned in the past, but they do not seem to carry the ones without cover anymore.
I guess I should have posted that in "Interior Restoration Forum". These informations were gathered thanks to my being very very very p*s*e* at Mr Camping World. It shows, you got to hold on to a thread and follow trough. They don't call me the piranha for nothing.
Hope this will help somebody.