This time last year, Sony released a special 20th Anniversary PlayStation 4 to celebrate 20 years of PlayStation (the original system launched in Japan in December 1994).

It went like hotcakes and has now become virtually impossible to obtain. Well, if you don't want to pay thousands of dollars for it, here's one last chance for all you collectors to win one:

Sony has announced a new campaign to support charity, and all you have to do is purchase a PlayStation Vintage Wireframe Theme from the PSN. If you do, you'll automatically be entered in a sweepstakes to win that ultra-rare 20th Anniversary PS4. The wireframe themes in question range from $2 to $100 and yes, how much you spend determines your chances because each dollar counts as one prize entry.

Proceeds will go toward The V Foundation to support cancer research (sports fans are likely well acquainted with the organization). Just buy your theme before December 22 and you're in. The full contest rules can be found here , and good luck!