If you have some woods nearby, look for some regular moss on the north side of a tree. Just wash it real well before using.
The only kettle finings I know of are irish moss and Whirlfloc (which is mostly Irish moss). The beer won't be bad without it. I never use any finings on my lagers and they come out very clear. If you have a good hot/cold break (vigorous boil and fast chill), that should help. Then crash-cool the fermented beer if you can before bottling/kegging. (You could also use gelatin or isinglass in the fermenter.)