Welcome from Minnesota!
I buy a couple of yards if the fabric is screaming at me to buy it. It has to be screaming... anything less than that I tell myself that I have so much in a stash already that I don't need another bolt put on a shelf. (I get the bolt cores from my LQS.) That said, I still have fabric that screamed at me, that I have never used. I guess my "screamer" was off...
Buy what you can. A limited budget never stopped me from getting my fabric fix.