As I recall the rollers are typically available from local hardware stores and Lowe's, Home Depot or ACE. The bigger problem is getting the door out, these are very heavy, and then back in after the rollers have been replaced. While I really like DIY, this is one project I will probably defer to professionals.
I agree with previous comment, home warranty should be able to give you the name of the suppliers of the sliders, as well as the installers, and they would be my first contacts for the repair.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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