These is a data sheet for the WS2801 
http://www.adafruit.com/datasheets/WS2801.pdf

But what should I be looking for ?

I found some cheap alternatives on ebay from hong kong which have 50 pieces 
for only $30
http://www.ebay.com.au/itm/like/121159316753?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=107

Any experience with cheap chinese parts ? Are they likely to be any good ?



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