i don't know where to get 1 fast, i ordered mine directly from them, but it may take 2 weeks if you do.
about installing them, all you do is plug the power in and hang it on the windshield. do not pay someone to do this, it is senseless. i have mine hardwired to the car so it comes on auto when i start the car. i did this in 5 minutes. again, do not pay for an install. i can walk you thru it over the phone in 3 minutes.
good luck finding one fast, tho. seriously, it will probably be hard to find for a prompt delivery.