Drs. Foster and Smith has already been mentioned, but that is a good place to get hay. It’s where I get mine. The prices are less than at pet stores. Right now, they have free shipping with any size order. At other times, it is free with a $19 order. In the past, you had to spend $49 to get free shipping. Although their shipping charges aren’t that high anyway. The orders come quickly and the hay is always fresh, unlike some that I’ve seen in stores. I get Oxbow hay and American Pet Diner Hay.
They have up to 50 pound bags of Oxbow Timothy hay, for $53,12. They also have 25 pound bags, 9 pound bags and small bags.
http://www.drsfostersmith.com/product/prod_display.cfm?c=6067+17311+30226&pcatid=30226
American Pet Diner has 2 kinds of Timothy, high fiber (first cut) and Timothy Gold (second cut). I get both kinds. It comes in a small bag or in a 5 pound box. The Gold is on sale right now.
http://www.drsfostersmith.com/product/prod_display.cfm?c=6067+17311+23195&pcatid=23195