Just as an FYI, I believe the last spool I purchased was Sowesco wire, .030" ER70s-6 and I paid around $70.00 for a 33-pound spool. Sowesco is a division of Pinnacle Alloys.
Personally, I prefer the -6 wire to the -3 that seems to be quite popular. The -6 wire has a bit more silicone in it and the toes seem to wet out a bit better.
Again, just my opinion.
Mike.
On edit, I just read that the question was asked for the SLC area. Sorry about that, I spouted off Ogden without seeing the actual area requested. I am sure there is a Norco Welding supply in SLC as well as Airgas.
Also, I agree on the welding wire as someone else mentioned above. I used Lincoln a few years ago but it was quite a bit more money. I then stumbled across the Pinnacle brand and have been using it ever since and I have been pretty pleased with it's weld quality.