HL has their knitting notions at 40% off.
They also have (at least in the one here in SD) Bamboo Yarn.
Hadn't seen it before, so it must be a new addition. It's called "Bamboo Spun". It's a worsted weight mix of 77% bamboo and 23% polyamide.
3 oz and 148 yards a skein. 5 mm needle recommended.
It's very soft and light.
This is their Ravelry description http://www.ravelry.com/yarns/library/hobby-lobby-stores-bamboospun
Sells for $4.99 a skein.
The ballband has hobbylobby.com on it, so it must be a store brand.