The cheap ones usually aren't of good quality and may ruin your experience with your phone. Go for something better like Nillkin branded tempered glass. The prices in India are a bit on the higher side but if you can wait for a few days then order it from ebay.com or aliexpress. It's cheaper that way. I myself ordered one from ebay.com a few days back for a little less than $10. The item has already shipped from Hong Kong and I should receive it within a few days.