Since no one else replied, I thought I would add a couple ideas here. Basically you can't find anything cheaper, b/c there is nothing cheaper. As an autoxer myself, I've researched that exact size for my Rabbit, and Diamonds are by far the cheapest, strongest and best looking -- for the price. I know a bunch of VW autoxers that use them and are happy, just get the proper lug nuts. A guy named Pete Paulsen makes wheels for circle trackers that were similarly priced, don't know any VW guys who've went with his wheels, but I can get the number if you like.
If I had some more cash, and autoxing was really important to me, I would go for them. But I picked up a set of 13x8 steel wheels that are basically OEM wheels but were widened to 8". I bought them with used Hoosier autoxers for $100. Couldn't pass up the deal obviously and the wheels have been great, and I know there are others out there like them. Try a place like vwvortex.com, there is a lot of <ahem> flaky people there, but they have something like 65,000 members so it's good saturation...
Otherwise, I have a set of 13x6 wheels with average race tires I'm selling for $100. These were my wheels before I got the 13x8s. You could probably fit 225 tires on them, and would be plenty of tire for a Rabbit.
PJ
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83 Rabbit GTI - future ITB