Hi asjdwf,
To get the “pillow bonus” you just need to call or email them to tell them you are a member here and make sure that the mattress is fulfilled by Dreamfoam not Amazon.
The foundation thread here has a large list of foundations in many types and budget ranges that will work. Dreamfoam also sells one here and they also have a list of acceptable foundations here ADMIN NOTE:Removed 404 page link | Archived Footprint:brooklynbedding.com/memory-latex-foundations.
Congratulations on your new mattress 
Phoenix