I'm pretty sure that F&S will as well. From the sounds of it Derek's having a hard time finding the quantities he wants. A company as large as F&S should be able to supply him and cheaply too.
Yes, you're right...I meant that being able to show F&S sale price, in writing, should help with LFS negotiations... where 20 boxes should be more important to them, then to F&S ... My friend and I have been ordering a pallet or more for many years, and the volume allows the LFS to get a bigger discount on his salt order.