3D glasses must match the TV model?

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I thought that every 3D glasses can be used to view any 3D Television, while I went shop with my co - worker for his newly - bought 3D Television yesterday, I discovered that wasn't so. The sales person in Fry's electronic told us that, you must purchase the 3D glasses which match the brand name of your Television, because of the compatibility issue, and there were different technologies exist in the 3D market. The price range was different; luckily, my co - worker bought a Sharp 3D TV, and the average price for the 3D glasses was around $59; while for Samsung, the range is from $100 to $200. I just wonder if I can get those glasses cheaper in Amazon.com?