I would go for the bus

The bus is probably the safer option. I've had many friends miss classes because they spent an hour looking for parking. It really depends on the campus though.

Ahhh the uni problems. I decided to move closer to uni so I could walk 15 minutes. Even with the parking label, there was no guarantee that one would get parking. Some days would have visitors, on others there would be too many students. The buses were notorious for never being on time and the peak hour rush in those buses was horrible. Your life sucks man.

I really hope you accidentally added some extra zeros in there, because those prices are just insane.

That's crazy! My parking pass as a commuter student was $180/semester (but I had access only to one lot), and you could get a city bus pass through the school for free. Are you attending a private university in a big city or something?

Pay the 100 and ride a bike

In my university we had a bus pass, but you could also buy single tickets for like £1.5 or 10 for £10. If that's a possibility, work out how many days you have to be in and whether that would be cheaper. This does mean that if you have like a 3-hour break you're probably stuck on campus, cause you won't want to pay double. if the bus connection isn't too bad (as in if you miss one, there will be another shortly) and driving there would take like 30 minutes anyway (+ find parking spot), I'd probs go with the bus pass.

Bend over and pay the $900. I'm at a place where they make faculty pay for parking! I bike, bus or pay an exorbitant daily fee to avoid that charge. In retrospect, it hasn't been worth it.

You and every other university student, join the club.

I'd go for the bus pass. You'd be saving money on fuel and you could also use the hour trip both directions to study, read, listen to music, snooze, etc.