Niagara Cycles has both 700c and 26" dynamo hub wheels for less than $85 + shipping I noted the other day. They also sell through Amazon. By far the least expensive dynamo wheels I have seen.
http://www.amazon.com/gp/search/ref=...mo+wheel&ajr=3
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/