Some sale prices -
... a mint but non-working one sold for $103 on ebay in January 2004.
... a working bull with no box or cup did not sell in March 2006 for a buy-it-now price of $125 plus $6 s/h.
... a non-working bull in very good condition (no box) sold for $58.79 plus $10 s/h in May 2006.
... very good condition but unknown as to whether it works, with torn box, sold for $165 in June 2006.
... very good condition with original box, non-working condition, no cup, sold for $85 in December 2008.
... very good to excellent with original box, has cup and solution bottle, works perfectly (included video), sold for $136.49 in February 2009.
... near mint, working, has blue cup, no box, sold for $114.51 plus $8 s/h in March 2009.
... near mint, working, has blue cup, no box, sold for $67.66 plus $8 s/h in April 2009.
... excellent, working, has blue cup and box, sold for $179.77 plus $11 s/h in May 2009.