I just finished my A.T. thru hike. Fontana village has a pretty good hiker resupply store right next to the P.O. The owners have been upgrading their stock and they had; Tuna packets, Knorr sides, Peanut butter, quick oats, fritos, and even some freeze dried food (yuk!)
This was back in March for me and the store had just opened up for the season.
By the way, next door is an Icecream shop!
Also the Pit Stop store just .3 miles down the road from the P.O. had gatorade packets, real cheese, poptarts, cliff bars, tortillas, salami, and a local Brew called Dragon Tail Ale that had 8% alcohol.
Anyhow, just saying you could resupply there if you are not too picky and it would avoid the p.O. hours and save the shipping.
Here is the Fontana Village porch in front of the store: