I had cards with less than $200 limits when I was an undergrad. In those days, there were no regulations against marketing cards to college students without jobs. There'd be tables all over campus giving away king sized candy bars or t-shirts if you apply for their card. As a student, I had no cares about inquiries to my credit history (which pretty much didn't exist).
Mostly, I just got rejected, but I did get my first card with that low limit and I used it to part together my first computer. I had to buy a little at a time over a few months, and as I was spending near the limit (and paying it off), I got automatic bumps. I did call to ask for more when I needed to buy a monitor and didn't have enough credit.
That was long ago. Now, I don't even bother. My limits are high, and I have several cards, and I never utilize much of the limit unless I buy a car and they let me use the card (cash back). Even then, dealerships often limit it to like $5K or so, so I'm still not utilizing much of the limits.