Amazon.com, Repair Parts Plus and UBreakIFIX are good sites for Samsung glass replacement, as of 2016. These retailers specialize in glass replacement for a variety of Samsung devices and other brands.
Amazon.com sells replacement glass for the Samsung Galaxy S3 phone. The glass is slightly tinted with a blue color and is easy to install. This product ships throughout the United States.
Repair Parts Plus offers Samsung glass replacement kits. The kits include the glass and the tools needed to do the repair. Samsung screen protectors and cases are also available from this retailer.
UBreakIFix offers repairs on phones, tablets, game consoles and computers.