Visiting student looking to BUY or RENT a used bike for the summer

Hi everyone! I'm a visiting student from National Taiwan University, here on the Peninsula this summer for an innovation & entrepreneurship program (early July through late August). I'm looking for a bike to get around campus and town.

I'd happily do either:
• Buy an affordable used bike, or
• Rent / borrow one from someone who isn't riding theirs this summer

I only need it for about 7 weeks(7/1-8/14), so a short-term rental works great — and if I buy, I'm also glad to sell it back or pass it on before I leave in late August. I'll take great care of it and return it in the same condition (or better!).
I'm on a student budget, so anything reasonable works — totally happy to discuss price. A lock and helmet bundled in would be a bonus, but not required. If you have a bike to sell, rent, or lend, please reach out — thank you so much! 🙏