Travis, you will need to get the Rawlings Official Major League Baseball, or ROMLB (the ones that cost more and usually come in the plastic cube case), for the best long term quality. Here are some of the problems that other, cheaper brands/kinds have:
1. they will bleed when signed, giving a smudge appearance to the signature
2. the autograph will fade over time, becoming less visible and eventually disappear
3. when exposed to direct light, the fading will happen quicker
I have found them at local retailers (Target, Walmart, Meijer) in the sporting goods section in the $20-$25 range, and even less when they get marked down for the 'out of season' clear out at the end of summer.
