I don't know who carries it; a Hallmark store perhaps? Google will probably turn up a retailer. I'm assuming you're asking for a seller; as you realize from reading the Forum Rules, this site neither supports nor condones piracy.
Following your own advice, and in context of the OP, a quick google search shows that people have been having trouble using it with Windows 7 and Vista. Considering it's a rather old product, that's not very surprising.
You can try running it in Windows XP compatibility mode:http://windows.microsoft.com/en-us/windows7/Make-older-programs-run-in-this-version-of-Windows
EDIT: If that doesn't work, there's a possible alternative here: http://www.fixya.com/support/t3596502-creatacard_gold_not_work_windows_7
(third response), if you have
to have your old saved files.