Both Peter-H and the rest of you is right. Asking for the most usual part is good practice, most times you select the part before you design your PCB, and just picking a part from Digikey is not always the right approach. I did ask similar questions from sales rep., it was a hit and miss, based on how prepared they were.
You ask the sales rep, because he has access to order history, their cost price, stock level nd so on, not because you are clueless, or lonely or trying to make friends.
And no, if you can buy a full reel, you dont buy from Mouser, why would you. I've seen reel of reputable 0402 that was 25 times cheaper to buy though other distributor than Mouser or Digikey.