Purchased on Amazon.com, 2013.
(plastic, 2.6" diameter)
Eleven balls protrude out of 12 holes (there is one empty hole at any time). A move consists of pushing in a ball that is adjacent to the hole to move from where it is into the hole position. Easy to solve; Jaap's Page presents a solution.
Jaap's Page, from: http://www.jaapsch.net/puzzles/index.htm