also, if you have a Cabela's visa card, they are applying a no shipping charge promotion until Oct 1 (promo code: clubvisa)
I don't see that they carry the Prodiamond, but they do carry the Tasco Pronghorn in 4X. That's a pretty decent scope. IMO better than the Simmons.
My fav though for a ML is the Bushnell shotgun scope. Its short and I love the circle/crosshair reticle.