After having contractors quoting plain jane single car wood frame garages from $15,000 and up we found Duro-Shed in our old Home Show file of pamphlets.
You can not beat the value for this product. Supplied and installed and including all the owner supplied items (paint, concrete pad, electrical hook-ups) we saved at least 30% off the lowest contractor quote.
Installation was fast and efficient.
Product (manufactured panels) is still looking great 4 years later. Read the product literature regarding caulking and painting.