Glacier Bay toilets are made exclusively for Home Depot, and replacement parts are available at Home Depot stores and on the Home Depot website. Glacier Bay toilet replacement parts can also be purchased at eBay and Sears, as of 2015.
The Home Depot website has all the replacement parts available for Glacier Bay toilets. The website also offers toilet repair tips from professional plumbers.
EBay has auction listings for Glacier Bay toilet lids and repair kits. However, prices and availability on eBay are subject to change at any time.
Replacement flush valves can be purchased at Sears.com. These valves are not manufactured by Glacier Bay, but work in most Glacier Bay toilets.