I've got a bunch of small bags of corn sugar from when I did extract (they came in the kits for free), but I didn't use them because I was kegging. Occasionally I'll have too much beer that won't fit in the keg, so I bottle a handful of beers.
I use 3/4 tsp for 12oz bottles and 1.5tsp for 22oz bottles. Make sure you put the sugar in the bottom of the bottle before you fill with beer, otherwise you'll have a foaming mess.