Why in every shop has different prices for the same item?


I want to have Ultra Rugged HD Sport Camcorder Digital but can not tell the difference and do not carefully choose. only wonder at you, why the same two items have a very significant price difference? or I'm dreaming?
if I ask for help to you to choose one of these products, which one would you choose?

choose 1 http://www.amazon.com/Powerful-Rugged-Digital-Camcorder-1920X1080/dp/B0086B9WI6/ref=sr_1_1?ie=UTF8&qid=1386230026&sr=8-1&keywords=Ultra+Rugged+HD+Sport+Camcorder+%2816MP%2C+1920X1080%4030FPS%2C+HDMI%2C+Macro%29

choose 2 : http://www.ankaka.com/ultra-rugged-hd-sport-camcorder-16mp-1920x108030fps-hdmi-macro_p47004.html

Thank you!