Well considering Sparrow trades between 10-11 firewalls.
10 x @20k each firewall 200,000k (trades between 18-24k each I'm conservative)
ice cubes trade between 750-1000 each
200,000/1000 each 200 ice cubes?
200,000/750 each 267 ice cubes?
That is my math, whether or not you can find someone who would trade - well that is up for grabs.