Doing the math, 288 strips that are 2.5 inches wide comes out to 20 yards. My LQS is about $11 per yard so it comes out to $220. You're saving about $50 if you use yardage and cut it yourself. Even though it is more expensive, it would be worth it to me to go with the jelly roll fabric to avoid the cutting, possible errors and all that ironing, to be able to just get right to work on the blocks. Time is important too.
I wouldn't factor in the batting and backing as this is going to be the same regardless of whether you use fabric or jelly rolls.
Sounds like you have a nice project ahead of you! Now get to work!
