Hmmm. I make 'em from scratch with an SX/B sample application, but there are a couple other opteions:
-Parallax has a serial 4 digit 7s LED that can have two units stacked together for 8 digits
-sparkfun has a 4 digit serial 7seg LED display with 4 digits (also non-serial versions) though the LED displays are a bit smaller,but it is cheaper than the parallax ones. They are about $15, come in 4 colors and are a snap to use.
-I got a good deal on 4 digit and 3digit LED displays at futurlec and they have a reduced pin count (still need resistors, etc)
Either way they are a bit pricey, but will do what you want. Hope this helps, good luck.