Petfooddirect sells Harlan 4018 for $26 for a 40lb bag. Of course, shipping will cost around $20.... (last time I bought, it was 18 to ship.)

http://www.petfooddirect.com/Product...erly-Harlan%29

Might be worth seeing if you have reptile expos near you. There is a Harlan dealer that goes to mine and sells the 40lb bags for 15 each.