Welcome to the forum, but hopefully you can post more coherent questions or better posts rather than what you are posting now. If you are asking where did I buy my laptop online, it was at dell, www.dell.com, hopefully we can see you contribute to our forums in a positive way.
Now a days we do have an option to buy electronic gadgets through their official website's itself. For example if you want to buy an Samsung laptop, then you can buy it from the samsung official website itself. And while coming to the third party online sales websites, i do prefer to use Amazon, eBay.
Or instead you can buy laptop replacement parts for your laptop. Visit Laptopaid.com for more information.
I am also prefer to buy electronic products from Ebay and Amazon first. These both are trustworthy and reputed online website for best buy on net. I'm also select some local online shopping site for shopping which are provided best offers, discount and most necessary free shipping servicing in less time.
Yes you can buy them on amazon & ebay as said, where i get most of my stuff. You can rely on them. Also check out TigerDirect online.
Try Amazon.com they got really good deals, or go to google buy! They are even better.. I wouldn't go ebay for a laptop, and if you want extended warranty check out the company's site instead. like sony, toshiba or so... I got a nice Toshiba Qosmio I bought from their site, customized and everything it's awesome.