I have been a Rockola fan for several years and have managed to accumulate the "Trifecta" (World's Series, Jigsaw and Army Navy) plus a few more. They are great games--we have them set up our atrium where they get a lot of attention and play by family and visitors. Of the three, the Jigsaw is my favorite. A few months ago I worked with Robin to post Pinside information on the three games.
Three years ago we bought a micro business (www.buckwerx.com) that makes restoration and repair parts for the Rockola series--hopefully to keep them viable for another 80 years!
Over the last 3-4 years I have been working on an estimate of how many games are still in existence--I think there are probably 200 Jigsaws, 500-700 World Series and less than 20 Army Navy's (I actually only know of 14). I believe a lot of these machines were consumed for scrap during World War II.
$1,000 for a Jigsaw is a pretty good price. I've seen nicely restored games for for $2,500. Fully functional World Series games go for $1,500. Army Navy's have gotten crazy--recently one was sold for as much as $14,000 as part of a Trifecta bundle.
They are a lot of fun--great collectors items. They appeal to a wide audience, I think the prices will continue to rise at least at the rate of inflation.