Assuming you are using HHC so you don't care the least bit what the print looks like...
On eBay, you can get 24" x 150' 20lb HP Bond paper for $15.95 shipped, 36" x 150' $17.78, 30" x 150' $17.95, etc.
Get the 36", cut into ~ 9" wide with a chop or miter saw, since if you're using HHC you don't care about the edges being as clean cut as from the manufacturers, and you have (4) 9" x 150' rolls for $17.78, or $4.45 for each 9" x 150' roll.