How do you buy your yarn? Where is your favorite place to purchase it?

I buy mine mostly at Wal-Mart and in a pinch from Moores Crafts

Do you know of anywhere that you can get really cheap yarn? I am working on a prject for some kids at a local homeless shelter and seem to be running out of yarn pretty fast do you have any ideas? I typically buy it at walmart or at hobby lobby but even with the same going and the econmoy being so bad it's hard to get enough to make a whole project!

I have bought much of the yarn I have on the local market we have every year during summer. It is cheaper that way. Maybe I could also buy some yarn from the Internet shops but the shipping probably costs a great deal. I am in a freebie program and it seems very good - have to keep watching if there are some freebies that the yarn sellers give away - they are adding new things all the time, so who knows.. At least they have some free jewelery every day, so that could be used for decorating our knitted clothes..