I need an IPSec VPN a couple times a year to get around network issues. Trouble is, when I need it, I can't connect to it to buy it, and I don't want to pay for

I need an IPSec VPN a couple times a year to get around network issues. Trouble is, when I need it, I can't connect to it to buy it, and I don't want to pay for it year round. Pay-as-you-go IPSec would be great.