Most are made in Asia these days. If your buying a USA made coil nail your going to be spending double to triple the price of a foreign nail.
Over the past couple years have been buying pallets of coil nails for a couple bucks a box cheaper than Home Depot and getting a Hitachi coil nailer as a bonus. Bought four pallets this way over two years and got three Hitachi's and a Dewalt.
Last Winter picked up two pallets for $8 a box. The lumber yard got 50 pallets whole sale and were charging $10 a box or $8 for pallet pricing. My Uncle picked up a couple pallets as well and now with one pallet already burned up wished I'd bought more.
Although a coil nail is just a coil nail and most are alike from time to time you will find bad runs. Surprisingly the $8 a box nails have performed better than the $23 a box nails with gun deal.