I use truffles in all kinds of stuff...you can buy truffle oil at most decent supermarkets now, but it isn't that great. you need to go to a specialty grocery to get decent quality truffle oil.
I make a bomb ass truffle mac n cheese
here's a video of me proving it 
When I was in Italy the last time I went to a truffle broker...it was amazing! here's a plate of pasta with black truffle shavings I had in Verona, Italy
