Acer W700 Tablet Cradle with inbuilt USB3 x 3 Connection.

I've recently purchased a W700 Tablet in the UK, where I live. The model I bought came with the keyboard and faux-leather case which turns into a stand, but NOT the plastic cradle with the in-built USB3 connections (3) and power by-pass connector. I would like to purchase the cradle unit that otherwise comes with the tablet, but can find no-one on the Internet who can provide it (it apparently only comes if bought together with the tablet and keyboard as one of two packages: mine - and the other one!). I've tried Acer in the UK and in the US, and various main suppliers but have had no luck with any of them - and no good advice either! Has anyone been able to obtain this cradle (stand or dock) to purchase from a supplier as a separate entity? I'd be grateful for help on this one, Thank you.