You could download the fonts to your machine(s). That way they will be served locally rather than connecting to fonts.googleapis.com

https://fontsplugin.com/how-to-download-google-fonts/

Depending on the signal strength at the place you are visiting you could invest in a 3G Mobile Broadband dongle.

Alternatively if you have plenty of time before the trip you could train someone to handle the business for you on a freelance basis.

SagePay (sagepay.com) is one option, it also integrates with CheddarGetter (cheddargetter.com)

I agree, that is the one feature I really need.

Doesn't seem to work for me, have the first 15,000 already been taken?

Building it - http://gettasklist.com

Cool!

Without a doubt one of (if not) the best idea/execution I've seen on here. Very well done, congrats!

I can't tell if your main keyword is "Organic Chemistry Notes" or "organic chemistry study guide". Find out which gets the most traffic and optimize for SEO around that term.

I'm wondering how much you can eventually charge for a service like this, especially considering it would be fairly easy for competitors to replicate and undercut you.

It's a conscious business decision they have made, you can do whatever you want to with your business. As long as it looks right in all browser/os configurations I don't think your customers will mind.