I bought 2x3 1/8 wall about two months ago and paid $4.80/ft. You might be able to get it for less in a bigger city. I'm out in the boonies of northern WI and have to buy my steel from a pier builder - not a steel supplier.
Also, the 2x4 tubing I bought was $6.10 a foot - so quite an increase there. 1x2 was $3.10 and 1x1 was $2.10.