MidTNJasonF wrote:http://www.thefoamfactory.com/mattress/mattress.html
3" conventional foam starting at $63 in queen.
3" memory foam topper in queen at $102
We bought ours from the same place and we are very happy. 4" HD foam queen size mattress, and it has been plenty thick for us.
Here's a tip, they offer custom sizes but they are much more expensive then getting a standard size. Your best option is to get a larger size then use an electric carving knife ($8 from Walmart), and trim to your specifications. It cuts quickly and cleanly through it. Use a board or straight edge and you will have a clean cut.