I found this video more interesting than I thought I would.
The M500 concert marimba has a range of 5 octaves, weighs 385 pounds and costs $12,500 US new.
+++ HERE +++ is a music instrument retailer with additional information. I actually found the retailer site to be more informative than the manufacturer's webpage.
Meanwhile the
+++ M55 +++ Vibraphone retails for about $4,400 US.