You can get a dynamo wheel at a great price from an American outfit. I have an IDC Stout front wheel with Sanyo dynamo. I couldn't pass it up for $95. It's a 700c rim whose brand name I've forgotten. It's not top end stuff, but it works flawlessly for me. Their website currently doesn't list the front wheel alone, but they list a pair like you're looking at, also for $200. It seems totally worth it.

Listing

I normally prefer building my own wheels because I enjoy doing it, but this was too good to pass up.

I've also picked up sidewall dynamos from ebay for about $15. They are loud, and anyone can feel the drag, but for a bike you don't ride in the dark much, it's great. It weighs less than a hub dynamo and is easy to put on. It produces at least enough power, probably more than needed.

I have learned that there are low end battery lights, high end battery lights, low end dynamo lights, and high end dynamo lights. Each genre has its pluses and minuses. It just isn't true that you can't run dynamo lights economically. You definitely can, and I do it on various different bikes in various different ways.