I don't buy very much plain steel. PDM is perhaps the best place, but they have a minimum order - either $75 or $150, I forget.
Reno Salvage on 4th St. used to sell *new* steel stock and they were cheaper with much less minimum order if any (cash only). Cheap/no cut charge too. I thought they stopped selling new material, but maybe not.
Next I would try Metal Masters in Sparks I guess.
Really though, unless it is really heavy I often do McMaster.com or onlinemetals.com. I order quickly, forget about it, and it shows up on my doorstep a couple days later. 6' of 1/8" x 2" hot rolled steel would probably be $6 or $8 each, but shipping may suck.
BTW what you are looking for is generally called "flat bar", and generally it doesn't come in gauges. 1/8" is close enough to 10ga (and overkill for what you're doing). Yes, you can get steel "strip" or sheared sheet in 10ga. but I never have in 20+ years.
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