perhaps if you make it clear that it's okay to Google, then you might get a different outcome. it's highly common for candidates to assume that in an interview, it's not allowed or highly penalized to do so.
for what it's worth, you can go to Starbucks, get a coffee for under $2, and with their current rewards program, unlimited refills all day long as long as you don't leave. if you bring your own lunch, it can be a really cheap place to work, as long as it fits your work style.
yeah, i paid less than a dollar for a super cheap domain, and created a catch-all email forwarder that lets me create any random email forwarding address that all forwards to my one email. i've used this method in the past to get unlimited free things at certain establishments that offer welcome gifts to new rewards accounts.
just curious: how do they ask for a tip? i honestly can't imagine any scenario where it's reasonable for a delivery personnel to ask for a tip, so i imagine it must be super awkward to even bring it up.