I like the Batting Practice ball from Diamond... I get them from Baseball Express for 27.99 per dozen. They have served me well... (no fair thinking; maybe your guys are really cr@ppy hitters!
I like the Mark 2 baseballs from Collegiate Pacific. They are usually pretty good and cheap. I even would use them on occasion for JV and freshman games when I started running low on game balls.
I can't find a link to them because I have no idea how to get to their website. If you search for Collegeiate Pacific you come to a clothing store or something.
I second the BP balls from Diamond. Should be less than 30 a dozen. The Diamond BP is usually a little cheaper than the Diamond Official League, but we get the Diamond OL and use them for subvarsity game balls as well.
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