Internet Auctions like Ebay
You would not believe how easy it is to get mixed up and send an item to the wrong buyer! It seems easy at first when you only have a few auctions going and can keep track of everything in your head. However, as your volume grows, this becomes impossible and you will be forced to develop a system that prevents mistakes. Another case for the classic rule of "Pay me now" (with your time) or "Pay me Later" (with time and money) but don't ever think you can get by without paying.
Consider these facts:
I am still working on my own systems to do this and will add to this section when I have something working.