Your local feed store has it in 50lb. bags for about $16. Great stuff! I got the tip from the folks over on the Daylilies forum - they use it a lot for daylilies (obviously) but I've expanded since I don't have that many and had to buy 50lb. I'm sure you have enough plants to use up 50lb. David, but for those who don't you can also buy alfalfa as rabbit food at pet stores in smaller packages. It's a lot more expensive though. Be sure it's not full of additives - you want straight organic alfalfa pellets.
So far everything has responded beautifully. Latest experiment, just before the holidays I amended some perennial plantings out front that are near my Lychee tree, and would you believe the Lychee has put out gorgeous shiny new dark green leaves in the last month, despite the wierd weather.