I assume you mean such as a Pocket or Hide away door? You can look on Rockler.com http://www.rockler.com/search_results.cfm?filter=pocket+door This may be some what of what you are looking for. Or if you want like a glass sliding door look here: http://www.cabinetware.com/Track.asp
There are many video sites online with "how-to" videos. A video for sliding door track installation could be found at Youtube, MetaCafe, or any of the other various online video sites.
You can find hidden barn door tracks for your home renovation project at specialty hardware stores or online retailers that sell sliding door hardware.
A sliding mechanism to repair a sliding van door can be purchased from a dealer for the vehicle in question. It is sometimes possible to find this part at an auto salvage yard.
You can find a screen for a sliding glass door by measuring the dimensions of the door and then searching for a compatible screen at a hardware store or online retailer.
You can find sliding shower door replacement parts at home improvement stores, online retailers, or directly from the manufacturer of your shower door.
One can find sliding door handels from online stores such as the website Amazon and the bidding website eBay. Alternatively you may purchase sliding door handles from a catalog store like Argos in the United Kingdom.
You can find a mirror door for a medicine cabinet at home improvement stores or online retailers that specialize in bathroom fixtures and accessories.
With the door open loosen the three bolts that hold the rear of the door onto the arm. Find out if it is striking high or low and gently move the door in the right direction a little bit at a time. Also check the bottom track for any obstructions.
You can find replacement glass door knobs for your antique cabinet at specialty hardware stores, antique shops, online retailers, or by searching for vintage hardware suppliers.
The hidden microwave in the kitchen can typically be found behind a cabinet door or inside a built-in cabinet.
To find a reliable service provider for sliding door glass replacement, you can start by asking for recommendations from friends or family, researching online reviews, checking the company's reputation with the Better Business Bureau, and requesting quotes from multiple providers to compare their services and prices. It's important to choose a licensed and insured provider with a good track record of customer satisfaction.
Online stores such as Lowes and MyKnobs provide a selection of cabinet door pulls. Some additional examples of these stores include TheKitchn and CoolKnobsAndPulls.