Looking for Estimated Value

Hello all,

I have a silent auction that I will be attending shortly which is being
sponsored by a Fortune 50 company. I was hoping to ascertain the
estimated value of several items going-up for auction. They a (all
with certificates of authenticity)

Set of 5 Autographed Baseballs: Alex Rodriguez, Sammy Sosa, Ken Griffy
Jr., Jason Giambi, Vladimir Guerrero

Each of the five balls can also be obtained separately

Jersey signed by Alex Rodriguez

Jersey signed by Vladimir Guerrero

Soccer ball signed by Pele

Any well educated thoughts would be greatly appreciated.

Thanks!