This is a pretty easy one. Amazon or ebay have a massive range of door hardware. If you're looking for something more special, however, check out overstock.com. for a range of very high quality products.
You can buy an adjustable garage door seal just about anywhere you can buy hardware and such. Try Lowes, Home Depot, or online at Amazon.com For good garage door repairs try garagedoor-guys.com
Home Depot, Lowes or any hardware store
You can buy a very good quality body for a Fender Telecaster guitar on the Fender website. They sell authentic hardware for the Telecaster guitar's at reasonable prices.
After measuring the door, you would purchase it with money from a hardware store or a place specializing in windows and doors.
You can go on Baldwin Hardware's website. You can also go into popular DIY stores and buy Baldwin brass door knobs from there. Alternatively, you can buy them online to Door Knob Discount Center.
WD40 its a lubricant you can buy at any hardware store
ace hardware or most of your smaller hardware stores
There are many places where one can buy cabinet door hinges. One can approach their local hardware store, a home improvement store, or order them on eBay.
You can buy a good quality door mat at almost all big chain stores. For a long lasting one, I would suggest going to a hardware store like home depot and lowes. You should probably read here: http://www.homedepot.com/webapp/catalog/servlet/ContentView?pn=KH_FL_BG_Doormats This website gives a lot of detailed info.
You can purchase a good quality pole saw from your local hardware or home improvement store. Failing that, you can try sites such as Amazon, Craigslist or eBay.
The cost of a wooden door really depends on what kind of door you need. The price of a plain wooden door with no hardware would start at around $75.00. Fancier designs and doors including the hardware can be much more expensive.
You can buy chisels at most hardware stores. They have excellent selections of chisels from average to top quality at Rona and Home Depot.