Yep, that's the ticket. Cheap touch-up sprayers. I try to clean em good so they last longer, actually they'll do quite a few bows... but they're cheap enough I don't feel bad about throwing them out and getting another one.
I too save some of the parts for spares, and they've come in handy in times of 'crisis'.
That gave me an idea.... they're so cheap, I should go buy a new gun... just in case.