You can check what position in line you are for a game by going through your request list, it tells you that information in the upper right corner of each game requested.
And if you don't do this already, when you request any game make sure you keep that box checked to be notified if a game is listed higher than market price. If you don't, a game you want may be listed but you won't have the option to buy it because you didn't have that box checked.
And I think if you have a game on your watchlist only (meaning it's not in your request list) and it becomes available (not matched with anyone's request) you'll get a notification and then you can search for it to buy. Of course other people may get the same notification and beat you to it.
Drink beer, be happy.