Howdy Anthony,
Once you decide what pin you're after, there are many on here that can tell you what to look out for, and what sort of price range you should be looking at. Don't be in too big a rush to grab the first one you see, as it is always better to take your time.
When you hit 20 posts you will be able to access the Pinball Trader section. Members often put up pins for sale there, and you will find that the ones that do go up are good quality examples.
Let the hunt begin!
Andy
