Hey dude, just so you know, Millikan's Oil Drop experiment is not exceptionally difficult. You'll need some oil, an atomizer (like a perfume spritzer), some sheet metal and wires, and a DC voltage supply. Then it's just a matter of sitting there with a stopwatch and ruler and timing drop velocities while you switch the field polarity back and forth, and waiting for a droplet to ionize. The tough bit, at least in our analysis, was deciding on the appropriate quantization, since you're getting numbers like 1e, 2e, 3e, etc., and need to extract e from them when the data can be kind of noisy.
Anyway, it's totally doable at the high school level, and is a great way for kids to practice experimental technique and "discover" charge quantization on their own. It's also a great opportunity to discuss the controversy over Millikan's results, whether you should compute results during measurement or just record blindly, and so forth. :)