I have tasted the beef from
Snake River Farms and found it delicious. I don't know how their prices compare to others, though. (SRF is a producer.)
Another source for SRF meat is
Fred Meyer. Again, I don't know about their prices.
Finally,
D'Artagnan is a reliable purveyor.
As for Lobel's -- yes, their prices are high, but they will tell you that their stuff is absolutely top-notch. (I just worked on a book of theirs, and they said that very often.) They are located in an outrageously expensive area, so take that into consideration.