I have listed some used T.A. chainrings to suit 50.4bcd cranks (sugino, TA, Stronglight etc).
2 inner: 46 and 47 tooth, & 2 outer: 53 an 56 tooth.
They are fixed price "buy it now" or best offer through ebay ... starting at around $15usd. I have a few cranks to suit also listed that are ending soon.
check 'em out - http://shop.ebay.com.au/