This is getting as bad the secret Xbox 360 Elite.
Not only has the PS3 20GB model not even been released in PAL areas it has been virtually impossible to in any NTSC areas either. Now news is coming out that the SonyStyle.com mothersip store is no longer stocking it.
Sony have yet to confirm that they are no longer making it but I think it is obvious to see that if you want one then eBay is your best bet.
Link to Sony Style stores done with 20GB model – Joystiq
Last Updated: April 6, 2007