He lists seven different signed 8x10 glossy photos with prices ranging from $10 to $40, with the $10 one being a collage of five of Larsen's basesball cards, and the $40 photo being the shot of Yogi Berra jumping on Larsen after the last pitch of the Perfect game. It says this one is signed by Larsen and Berra. That sounds like a pretty good deal.
The photos are $1 extra to have personalized.
An autographed baseball is $35, with $1.50 S&H and $4 to personalize it. It doesn't say anything specifically about inscriptions.