xl5 is 49 bucks at deepdiscountdvd, a lot cheaper than amazon. I loved that show as a kid, even had a model fireball and then built space city with one of those "Super City" building set's. I may buy it, but I can just hear the moans and groans from my wife and kid.
Then again, that might be reason enough to buy it.
http://www.aiai.ed.ac.uk/~bat/GA/fireball-specs.html