I get it anywhere from $70-$75 a stick thats 1.75x.120wall dom. Now hrew is around $25-$30 per stick. Price varys on how many sticks you buy. Last xj exo had around 8 sticks in it including building rock sliders for it.
I've been getting HREW and bigger DOM sizes from PRC (I think that's the name) I'm pretty sure it's in Dallas or west GA area at least. They aren't technically PRC anymore but the owner is more than willing to sell some tube at a good price. He usually let's me come on Saturdays too because he has a guy or two working.
If you ever need less than a full stick, check out steel materials in Cartersville. They're on the higher side of things price wise, but sell by the foot and no cut fee, so it evens out on smaller stuff.