It all depends on what was wrong with it
and also on what Best Buy do with it - handing the machine to them was night the brightest thing to do. As a rule companies like that are not data recovery specialists: my guess is you'll get the machine back with a new hard drive, or the old one overwritten and the data lost.
What you also have to remember is that if there is a hardware fault on the drive, then recovery attempts can make the situation worse.
If the problem was simply a software issue, then theres quite a lot you can do yourself. Apart from simply running CHKDSK, or the drive manufacturers repair utilities there are a couple of useful data recovery tools: Recuva and GetDataBack. Both are easy to use though time-consuming.
Now the big question is, what are the symptoms. A "crash" can mean a lot of different things. What actually happened?