Well, generally speaking, there are many places where you can buy 3d glasses. For example, you can buy them at https://shopping.rediff.com/product/3d-glasses/#!3d glasses. And it can be wonderful. And actually nowadays, 3d glasses are very popular with many people, especially young people. Because of their special functions, they are more attractive than the regular glasses. The 3D effect relies on your two eyes each seeing a slightly different image, in which your brain then combines into a three dimensional picture. So when you have worn a pair of 3d glasses while watching 3d movie, it will make you feel that you are just in the real phenomenon. Anyway, it can be amazing. So you can just buy ones and have a try.
Well, it seems that you are going to enjoy 3d movies at home. So, as a matter of fact, 3d glasses, is also divided into different types, so you should get the type that is suitable for your TV set or something. Of course they could be found on the Internet, although some places do not have them at all. Here I recommend Alibaba to you, which is a large site full of millions of different products, hope you find this useful.