I would try eBay but make sure your computer can run it. Sadly neither of my machines are able to run fcp7 anymore . If you don’t have any luck on Ebay try amazon marketplace.
Try playing around with the posterise and negative effects, alter the opacity of the effects and play around with the sliders. You can get some amazing results.
Maybe play around with the opacity on a gradient. With the upper part of the image being the most transparent. Or play around with different textures and alter the transparencies.