Originally Posted by Crunchmeister
Now, if you see something with SPF, you can always contact the seller anyway stating that if the original buyer backs out of the deal (which does happen), that you're willing to buy. But most of the time, SPF will mean it's sold.
Crunch has a good point here. If you see something that you really want and it's SPF then there's still a chance you might be able to get it, if the original buyer backs out. So by all means private message the seller saying you're interested in purchasing the product if the orginal buyer backs out. I've managed to get several hard to get items that way.