Light weight, not a big box but larger capacity than a 16a. I think I found the best option as it's from Canada, meets the requirements for the 50% rebate from the Government and free shipping, will just have to find an adapter to a Nema 14-50 plug.
http://boutique.roulezelectrique.com/collections/bornes/products/borne-de-recharge-240-volts-evduty