I haven't tried eBay yet but I am soon going to, their policies also seem very fair. Although they don't have a cash on delivery system, but you can find lower prices there.
I would recommend you to try flipkart as your first experience, its the best and most professional and 100% reliable. And if you like you can also try eBay since they only pay money to the dealer after you confirm proper delivery, just buy from a reliable dealer.
Just to add to the first answer, you can opt for Cash on Delivery (CoD) services. A lot of these sites offer this; I know Flipkart does. You can get the instrument, check if it's fine and then pay.
Not from where I stand. sites like google shop and yahoo shop are relatively safe. but any of those sites that you've never heard of is best to stay clear from.
It's depend on authority you have to choose right site.
Yes like countronics.com
ya .... most of them r believable .
I want to by mobile phone through online shopping. Some people says that the online shopping sites are not beleivable. i visit many sites like ebay.in,snapdeals etc ,the price of mobile phones are very low in these sites(some time shows only half price). Are these sites believable?