Not easy. Good smooth-walnut reproductions can be had for about $50 and up from various common sources (e. g. Numrich), but originals not so much. They don’t show up often enough for any general guidance what price to expect, and condition matters too. So you’re at the mercy of the seller.
Not easy grips to find. Don't forget, there were 2 different styles of grips, early and late, and to be correct you'd need those specific grips. (Both styles were smooth walnut, so at least the wrong era grips won't read totally wrong)
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