There's lots of manufacturers to choose from for the Ruger Mark II.
Morini grips are great but their prices are out of this world. Usually they start at $280 and go up to $2800. The price depends greatly on the type of pistol and the style of grip.
Other manufacturers like Herretts, Randal Fung, Vitarbo, and Nill make good grips that are comparable to the Morini. In fact the Vitarbo (ones pictured above) are very reasonalbe at $85 for the unfinished and $95 for finished versions of Mark II grips. Here's a link to a supplier of Vitarbo grips: http://www.nealjguns.com/ss_store/CustomGrips.html