You can buy refurbished laptops in Bangalore from various sources such as online marketplaces like onesquaresolutions.com, Amazon, Flipkart, and eBay, as well as from local computer shops that specialize in refurbished electronics. Additionally, you can check out refurbished electronics stores or authorized resellers of refurbished laptops in the city. Always ensure that you are purchasing from a reputable and trustworthy seller to guarantee the quality and authenticity of the refurbished laptops.