Most health food stores have them. I use GNC's Natural Brand. The lable says Enzyme Digestant. The ingredients are...

Pancreatin
alpha-Amylase
Betaine Hydrochloride
Pepsin
Papain
Ox Bile Extract 8:1

I only use this one when I've eaten protein. For everything else, I use one that is entirely vegetable based. Dried papaya can work well too. These are both available at most health food stores.