Hi Gozoogle,
The tutorial post includes this link to a list of the better online memory foam options I’m aware of but if 7 - 8 lb memory foam (at least in a relatively thin top layer) is an important criteria then those are the two that include it (NOTE: Christeli is now using 6 lb memory foam … see post #5 later in this topic).
Select Foam isn’t CertiPUR certified as a mattress manufacturer but the foams they use are made in North America by a CertiPUR certified foam manufacturer.
Atlantic Beds here also has some mattresses that use US made 8 lb memory foam as well
Phoenix
NOTE ADDED: Because of ongoing customer service issues and delays Select Foam’s membership has been terminated and I would read the warning here before considering them.