That depends on where you live, up until the end of last year it was quite a bit cheaper for me at least to buy bulk and the S&H costs for MB and Williams were comparable. Since about November though the rates have gone through the roof and it's now cheaper to buy 10# bags. Interestingly, MB's bulk rate is about 40% higher than Williams, even though their warehouses are within a few miles of each other and total shipping distance is essentially the same. I guess the upside is I don't need to worry any more about how to open the flipping bags or how to reuse or recycle them.