I check the deals of most of the deal sites on a regular basis. Most of the deals I find on Snapdeal are useless since you can get the deal for even less. For example, check today’s deal which is about domain name and email for Rs 599. This is available for as less as Rs. 300. Here is a very nice post about this deal - https://dealsexposed.wordpress.com/2011/03/31/review-of-snapdeal-aonesite-deal/
Moreover, never buy a "product" related deals from such sites, e.g. phones, camera etc. If you’ll go to market then you’ll get them for lesser price.