Having looked all over the internet for an independent, third party company that makes a vertical grip for my a65, I've finally found one. It may not look the business but I'm sure it's better than nothing.
I'm planning on making my own using an old a200/a300/a350 grip (the 'Meike' ones) and a wired shutter release that will be soldered to the switch. Inspiration taken from here - http://www.dyxum.com/dforum/topic828...0.html#1015010
SO, there you have it. A vertical grip for the a65.