I have two shuffle alleys and one ball (3 in.) bowler in my game room, and actually prefer the shuffle alleys over the ball bowler. Faster learning curve, and game room visitors seem gravitated to them. The ball bowler requires more skill to compete.
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Also have a skee ball machine, 13 ft. long, which is always a crowd pleaser.
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As for prices on them, condition plays a major role, along with completness. They are relatively easy to get up to normal operation, but a bear to move. Values will range from clapped out machines ($100) to nice examples ($2500) with the exception of the very long, large-ball bowlers which can cost in excess of $5000. Look for one that hasn't been in a flood, that was working when it went into storage. And prepare your room for the length of it.

The Bowl A Rama is a large ball bowler? Over 100 - You must have a vast knowledge base! The long lane and large ball, I'd have to agree, that'd be the best ever.

I agree too, that repairing and restoring these machines is very satisfying once they work properly.