I ordered
from Amazon because I just needed a quick set, but you can probably order from an actual provider and get a nice bulk deal (
example)
Just from experience:
- My old team's mentor just purchased roughly 30 and hands them out to people with glasses at the beginning of competition and collects them at the end. It was the best thing ever.
- If you're purchasing them for your team, I'd recommend purchasing the rubber-ish ones over the hard plastic ones. The rubber-ish ones can handle thicker frames a little bit nicer, and I suppose that's a trend now a days.
- Sunny G.