Lifesizing a ram seems to be running from about $2,500 to $4,000 approximately. The spread sometimes depends upon a taxidermist's existing workload, fame, custom work done on the form and/or habitat/base.
I can second Buzzi Cook, he's actually out of North Bend, WA. He did my wife's California bighorn (she drew when we lived in Washington state) and it is terrific, although is a shoulder mount.
JOHN O. "BUZZI" COOK III
OLYMPIC TAXIDERMY STUDIO, INC
47009 SE 153rd ST
NORTH BEND, WA 98045-9247
425-831-6273..B
425-831-6276..F
One word of caution on using a taxidermist far from you home. You usually don't get to stop by and check on progress when work actually starts and shipping/crating cost can really add up fast.
Just south of Wyoming, in Colorado, is Barry Smith. He does quality work and is particularly good with mountain sheep and goats.
Alpine Taxidermy
970-725-3534
813 Maple
HOT SULPHUR SPRINGS, CO 80451