I have sourced all my tools, building supplies, garden supplies, and all sorts of other bits and pieces. And if they don't have something in stock they can get it in and very quickly.
These guys have all the technical knowledge needed to help help you with whatever you need to do. They have enabled me to build my deck, re-plaster walls and and a stack of other jobs round the house.
Best of all, they know me by name. Try getting that from the big green shed.

Approximate cost: $10000

These guys are able to help you with any questions you might, everyone of the staff know exactly what they are talking about. The only problem with them is that their range is a little limited, they dont quite have everything you need.