I have been doing some research into the MIL-F-6218 "Fishing Kit, Survival" and have found that they are difficult to locate.  After searching all over the internet, I found one unissued kit at $7.00.  Of course, I quickly snapped it up.  There have been a few on eBay, but they are expensive ($25.00) and in one case, incomplete.  I'm surprised that these are so hard to find.  The Fishing Kit is well-constructed, practical, and cheap.  You'd think one of these contractors would market the product to the public. . . .
I have also attempted to contact wholesalers who carry the item.  I may attempt next to call  the contractors.  I'm not looking for a sideline business, but I think there's a market for the kit and I'm sure some business would be willing to carry them.
Regards