Every time I see Lasonics on japanese auctions, they fetch good money, compare to the well known "heavy" boomers,
 check this one http://injapan.ru/auction/r74970702.html
10 bids and $204.
And the same time "local"   Sharp's, Aiwa's, etc. for 20 bucks have no bidders at all.
http://injapan.ru/category/44764.html