I'm not sure there's any such thing as an inexpensive variable speed peristaltic pump. 
But something like this might be your best bet:
http://cgi.ebay.com/ws/eBayISAPI.dll...E:B:SS:US:1123
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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