I think my current package was (3) 5-packs?? of Olfa name brand for around $40 including postage, but you gotta get the sales. Sometimes the fabric sites will have good deals as well, always check before you check out! Years ago and sometimes you still see them, Joann had super cheap cutters that I could buy on sale or with a coupon for just a couple of bucks.
While part of me balks at the idea, really -- $3-5 extra per queen quilt even is still cheap compared to the fabric at the $10-12/yard or time or even thread.
One thing to watch for is if you have two blades stick together. No, they don't cut better than one, they cut worse!