Yes, I would *definitely* recommend finding a second-hand film scanner. I think you will need hi-res scans for a photography class as I'm sure the quality of your work will be of significance, and cost will be a major factor if you are dealing with some volume as it sounds like you are.
A little while ago I got a Minolta Dimage Dual Scan II, which is an inexpensive scanner from five or six years ago. Cost me less than $100 but I may have gotten a little lucky with that, but it's not too far from what you'd expect. With it the process is still time consuming as it takes time to remove dust, adjust colours and exposure and sharpening as needed, but the results are very good. Definitely what I get from it is significantly better than what I was paying $8/frame for, as they are 30MB files and noticeably smoother and richer than the pro labs gave me. I am told this is largely due to the time put in scanning, and if the pro lab spent more time with a specific scan they could get better results but you can't pay them to do that.
So I would think most mid-level scanners would do what you need for a decent price.
If you want, email me or PM me and I can send you sample scans of cheap scans, expensive scans, and then scans with my old machine so you can see what I'm talking about.
Dave