It's a 3 on a 407 chance you will get a specific car, try going to licence B1 and skipping to B6, you will get a fresh used car store
Actually, this method applies to any of the license tests, not just the B license.
Different for everyone, depends on which "day" the game starts you out in. Personally I've seen 4, but I'm also on my in game 1150th day.
It's said to pop up in the UCD roughly every 300 or so in game days.
How do you check what raceday your on?
4.8mil and some change, also have to be LVL24 to purchase it.