Who is providing cheapest Plesk licenses which can be used on any server?

http://www.odin.com/products/plesk/buy-plesk/ - unlimited Plesk 12, $15 VPS , $35 dedi ($385/year) <<<

rest im not sure if thay do not require to buy server from them along with license:
https://www.aihoster.com/en/licenses/plesk-12-edition/ - Plesk unlimited 12, $13, $45 dedi
https://paneli.st/plesk-pricing.html - unlimited Plesk 12, $15 VPS , $45 dedi
https://www.openprovider.co.uk/prices/