I have used Dilworth Mattress several times over the years. At first I thought they had closed, but they only closed their main show room and now use part of their factory on tremont as their show room. The owner is the salesman and is the third generation owner. He really knows his stuff and was willing to do whatever was needed to make me happy. There is a delivery fee as they use a third party, but if you have the means I'm sure you can pick it up yourself..
The prices seem pretty high to me, but every time I sleep on a different mattress I either wake up with pains, don't sleep well, or wake up with my arm and hand completely numb. It is worth the price to get a restful night. I threw out a 3 year old pillow top mattress to get a dilworth mattress. My last Dilworth mattress is a queen size about 12 years old and still love it. It is now in the guest room and I purchased a king size. (All the beds my wife had when we got married are now gone due to discomfort)