It doesn't come with nearly enough. They really outta ship it to you with at least 10 clips to get started. Plan on ordering about 20 of 'em just to have around. If you run it a lot, you're going to need more, with the 100 pack being a perfectly sensible option. The clips generally hold up okay, but they don't last forever.
I have the Brownell's demooning tool myself.
I got some RIMZ clips which are perfectly adequate for plinking. You can't use them to carry reloads or anything like that, but it lets you save your metal clips for more intense uses. I find the clips wear out from the constant demoonining/remooning eventually, plus the occasional one you just lose.