I've seen a couple for sale on the 'bay in the last few years (I was looking for a 5 or 7 speed IGH built onto a 27" wheel). Varying quality, for sure, but never very expensive.
Here's a pair (in steel) for $68 shipped.
Schwinn 27 034 x 1 3 8 034 Bicycle Wheel Set s 6 Bike Rims Sturmey Archer 3 SP Coaster | eBay
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● 1971 Grandis SL ● 1972 Lambert Grand Prix frankenbike ● 1972 Raleigh Super Course fixie ● 1973 Nishiki Semi-Pro ● 1979 Motobecane Grand Jubile ●1980 Apollo "Legnano" ● 1984 Peugeot Vagabond ● 1985 Shogun Prairie Breaker ● 1986 Merckx Super Corsa ● 1987 Schwinn Tempo ● 1988 Schwinn Voyageur ● 1989 Bottechia Team ADR replica ● 1990 Cannondale ST600 ● 1993 Technium RT600 ● 1996 Kona Lava Dome ●