Be aware that there are multiple colors of signature on Majin Vegeta and they don't come with a certificate of authenticity, so be careful if buying from anywhere but straight from Over9000 (
Funko Pop Over9000.com Exclusive : Majin Vegeta #445 – POPNATION
Funko Pop! Dragon Ball Z - Majin Vegeta #862 | The Amazing Collectables
Chris Sabat Signed Autographed Majin Vegeta Funko Pop Over 9000 JSA COA 3 | eBay