I attended all of the Double AA Wichita Wranglers home games in 2006 (Royals AA team at that time) and had a lot of opposing teams stars sign balls for me. No COA but will guarantee it passing JSA or PSA verification. 

Corpus Christie Hooks
Houston Astros
Philadelphia Phillies
San Francisco Giants
Texas Rangers

Look at the provided photos for condition. If you have any questions, be sure to ask before buying.