Purevpn : $2.91 (if you buy yearly plan)
Expressvpn: $8.32 per month
Hidemyass: $4.99 per month
Nordvpn: $4.00 per month
IPVanish: $4.87 per month
Sources: https://www.bestvpnprovider.com/kodi-vpn/
https://www.kodivpn.co/kodi-vpn/