Drugstore, maybe even pharmacy area of local grocery store would have the disposable latex gloves. Home Depot or Lowes would have bags of 40 gloves if you don't want 100. I keep a pair in a baggie with each spare innertube along with a wet-nap thingy in my seat pack. Doesn't really take up any additional room. For your class you might bring a bottle of hand cleaner - I think it's called Gojo or something like that. Comes in orange bottle. It also works on clothes if you get grease on them.