Going in 3 weeks. Looking to up grade to a mustang or similar are there any good deals to upgrade and wot sort of price will it be?

They do have last minute specials, keep checking their site. I've gotten some good deals, but last month they had nothing much.

They do offer upgrades... although we did not take them up on it and dont know specifics, I recall that the price difference was pretty reasonable.

Join the Insider program will get you a free upgrade.