In that price range you will likely be getting an aluminum frame or steel frame which is fine. They are very durable so you can get a bike that's a bit older and it's still got a lot of life in it. Maybe others can give you some advice on specific models but an older Cannondale CAAD can be had in that price range. I'd recommend figuring out your size and scouring CL. Others in the same boat as you have posted links to the CL ad here to ask advice. People on here can tell you if the bike is worth it or not. Since you will be riding to school, you dont' have to invest in expensive shoes, bike shorts and all that. I assume you have a helmet already. You can ride with tennis shoes and use flat pedals. Invest in a good lock if you will be riding it to school.



Post some links when you find a bike you are interested in. Remember, a lot of people on CL ask way more than is realistic, knowing that a potential buyer will offer less. If you have 360 to spend you might to able to seach for bikes in the near 500 range.