You should treat yourself (when you can) Tamer! There's nothing like the rush that comes from donning the costume and becoming one of our favorite characters. believe it or not the Driver suit is more simple than the TK suit. With less armor you'll be more comfortable--even able to sit down (lucky!). Basically it's the same as the Tie Pilot suit. Say the word and give me a budget that you'd like (I'd say at least $600) and I can start scouting around.
What I'd do if/when you're ready would be to put a "WTB AT-AT Driver" ad up on the world wide 501st forum. Once I had a suitable seller on the line, I'd give you his paypal email and have you trasfer funds and then give him your shipping address. Don't worry about scammers. The 501st weeds them out and bans them. This would be a much better method than dealing with eBay scalpers.
Thanks for the FP again! Only fitting that you get your figure fame to the fullest
Tune in tonight for a VERY special AFE action figure review and pictorial!