You can buy a travel router like the GL.iNet GL-SFT1200 (Opal) for $39.99. All of Gl.iNet's devices run OpenWRT already. Setting up Wireguard on OpenWRT is easy, and using Tailscale is even easier!
Edit: Jeff's been creating awesome Raspberry Pi content for a long time and I'm glad that he's not stopping given the current circumstances. I hope that his audience has an abundant supply of unused RPis looking to be utilized.
In Jeff's shoes I'd want to speak to those in his audience who DON'T have a Raspberry Pi and save them from paying scalpers prices until things return to normal--assuming that they ever do.