I absolutely love shopping from my couch for things like this! Stocking up and spending less time walking up and down the isles at the store = Happy Momma!
You can pick up Nestle Hot Cocoa Packets (50 pk) for $7.99 right now at Staples.com (yes, odd place to buy cocoa, but hey, works for me!) and shipping is free. That works out to $.16 per packet. Most of the regular sized boxes contain 10 packets, so that would be like getting the regular sized boxes for $1.60 each.