You can always check out eBay and see if there are any for sale, if you don't want to drive anywhere. Granted, some of them may be used, but the conditions should be written down on the auction page:
http://clothing.shop.ebay.com/i.html?_nkw=gasoline&_sacat=11450&_trksi d=m270&_odkw=gasoline+cargo+shorts&_osacat=11450

