Hi scheurmank,
Post #5 here has many good choices in a wide circle around Sacramento. There are lots so I would suggest first looking at their sites (for those that have one) and then making some calls along the lines of this article to see which ones offer the mattresses you are most interested in looking at and the service and knowledge that you are most comfortable with.
Some are a little further away than others but in many cases a drive (with some initial research and phone time first) can end up saving you both in terms of time and money 
Phoenix