I'm about to start up longboarding. If anyone here owns one, what would be a good beginner's board or parts setup? My budget is around $100-130.

Mmm, depends which you plan on getting into.
For instance, do you plan to cruise, freeride, or hit downhill?

Since you're planning to start, I suggest looking up a good cruise longboard and taking small tutorials.

I'm going to do cruising and downhill. Maybe later on when I get better I'll do freeriding too. If it's relevant, I weigh 127, and I'm 5'8".

Also wear wrist guards, I don't give a ♥♥♥♥ if you don't "think it's cool" or something, if you like to keep full function of your wrists and hands, do it.

That and I want my brain intact, too.

I got one of the big Sector 9 boards. When I bought it, unbeknownst to me, it ultimately was a heavy and durable downhill board. I used it for cruising anyways because why not. It's kind of collecting dust now after I forgot about it, and since I moved away from the apartment complex close to the parking garage I would ride in. I'm amazed I wasn't ever hit by a (moving) car there.

If I see you and I'm in a car, I'll likely do everything in my power to hit you.

Typical forumite mentality

It's nothing personal, I just hate longboarders.

I haven't been hit yet. Well, once I bombed a hill and I bailed at the base because I was going too fast. Board flew into a passing car.

It's nothing personal I'm just going to do my best to do you possibly lethal bodily harm

We have so many damn longboarders at my college.
Before coming here I had never so much as heard of it.
Now they are a plague.