Update:
How to display Bitcoin Price with two decimals:

set stockValue to do shell script "curl -s 'http://download.finance.yahoo.com/d/quotes.csv?s=BTCUSD=X&f=l1'"
return "Bitcoin " & "$" & ((round (stockValue * 100)) / 100)

h/t Vlad on Twitter for his help:

https://twitter.com/vladpresedinte/status/895707105902051328

- vladpresedinte