We had a temperpedic on box springs for a number of years. When we had kids we moved it to the floor. The support and comfort on the floor vs the box springs was amazing. I don't think I would ever buy box springs again.

We have a kings down now, but it is still on the floor so I can't help you with a recommendation for a particular platform bed.

Interesting, boop. Too bad the Costco "platforms" are so crummy. They would be perfect to mimic the floor.

My last platform bed was on a solid wood base. The current one uses only slats to support the foam mattress. Both were extremely comfortable, and I would not consider box springs as long as a good quality foam mattress is on the bed.
As an aside, I've used a memory foam topper on my hide-a-bed. It held body heat and was too warm for my taste -- just something to consider.

i have a memory foam mattress on my daybed. the foundation that came with my daybed is just a bunch of wood slats, spaced about 1.5 inches apart. the mattress sits very firm and solidly on this and feels very comfy (we always fall asleep on the daybed).
they sell this type of foundation at ikea even or you can even buy some planks at the hardware store too.

I think you should look at getting a basic metal frame with a mattress foundation. True box springs are rarely used anymore and foundations are replacing them. A foundation would be solid enough to support a foam mattress.
Other option is to buy a bed frame that has wood slats.

Visit your local Mattress World or any store that sells mattresses. They can set you up with a frame and foundation.........possibly for less than what Costco and Malouf are charging.

I too have had a memory foam topper that was too hot. The mattress we are looking at buying has a foam/gel top layer which from all I can read dissipates the heat. DD and DSIL have a similar bed and love it even though DSIL is a very hot sleeper.

The reviews of the Costco mattress are generally positive and CR rates it high. Plus, Costco has an excellent return policy.

I live in the boonies. There is no dedicated mattress store closer than an hour's drive. We do have a couple of cheap furniture stores in our little town. I'll see what they have to offer now that I know what to look for.

Is there a good reason to switch to a "foundation" rather than box springs if we already have box springs?

Also, bbstx, I also sleep very hot, and am too warm with even a regular mattress. Could you point me in the direction of the mattress your DD and DSIL have?

sjhockeyfan: the following was taken from memoryfoammattress.org....
"A good memory foam mattress will not need a box spring underneath it to make the mattress feel good. You can order a platform base to increase the height of the bed, but remember that this mattress should feel good if it was placed on an even, concrete surface. A good way to test the surface of a box spring or box foundation is to sit or even stand on various areas and see if it compresses underneath you. If you have an existing foundation that is weak, you can easily place two cut 3/4 to 1 inch thick plywood sheets over it to give it the necessary support."

annz, does that apply to a regular mattress too, or is a box spring necessary?

So any updates on the Costco Novaform mattress? The reviews are not great as far as off gassing goes. That is a huge negative for me. The price seems competitive. Also a few complained that it was too firm. I'm surprised Consumer Reports didn't mention the odor problem?

I have a Simmons comfortpedic gel foam memory mattress, I have to say it sleeps much cooler then my old regular mattress. The gel foam is suppose to be temperature neutral.

I'm normally a cold person, so I didn't want a mattress that felt cold, but I'm also at the age when I wake up at night due to hot flashes and feel like I'm on fire. The new gel mattress is so much better then my old mattress when it comes to feeling like flames are shooting out of the bed during a flash. My sleep is much improved.

Not sure about the Costco brand, just keep in mind the thicker the mattress the better it should wear, and it is more expensive. People that are heavier need a thicker mattress, at least 10 inches. Costco has a great reputation.