As long as you only connect from one IP and only ever access one host, sure! That's not trivial to achieve with most VPN clients and devices/operating systems, though.

How would you pay cash for an online service?

One quick google away:

> Can I really pay with cash?

> You bet, and please! Stay anonymous all the way. Just put your cash and payment token (randomly generated on our website) in an envelope and send it to us. We accept the following currencies: EUR, USD, GBP, SEK, DKK, NOK, CHF, CAD, AUD, NZD.

https://mullvad.net/en/pricing/

you can mail them cash with your account number.

They accept Cash and also Crypto.

Mullvad accepts mail-in cash.