I would like to know the name of this instrument and may be some suggestions on where I can buy one.
closed as off-topic by nonpop, Dom♦, Bradd Szonye, Bob Broadley, Tim Aug 5 '14 at 5:24
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This is a concertina, and like Calculus, it has both English and German origins: 1829 by Sir Charles Wheatstone, 1834 by Carl Friedrich Uhlig. The original versions had a visual difference: the English version with 6 sides, while the German version initially was square but later there are German versions with 6 sides as well.
Other variations: eight sided are called Aeolas, while Edeophones have twelve sides.
This member of the accordion family has some interesting history as well as differences from places of origin. I recommend reading more about what each version offers.
Things to consider:
Bisonoric or Unisonoric,
Single or double action,
Positioning of buttons,
Type of reed (steel, brass, or nickel...).
Scales and Range.
and more can be read here in the reference below.
Prices range from $179 to $500 and above depending on craftsmanship, materials, collectability, and other market factors. Here are some online retailers.
DISCLAIMER: I am not making a recommendation only providing what I culled from the web.
That's a concertina, a traditional European folk instrument. They are basically two different kinds, with different fingerings, English and German. The guy in the blue shirt closest to the camera is playing an English; you can tell since it only has thumb straps.
I can't recommend who to buy from but don't buy from Musician's Friend or Guitar Center. Those are awful.