I'm a hot sauce and hot pepper nut. Sauces and peppers are rated on a scale of "Scovil units"--the more,the hotter. Regular red Tabasco rates about 2,500 Scovils. El Yucateco green habanero sauce is about 8k. Kid stuff.
I buy my hot sauces from Mo Hotta/Mo Betta, or Peppers, both mail order or Web catalogs. I have one that I put (sparingly) in food that rates 330,000 Scovils, and a bottle of habanero extract that I use in soups with an eyedropper that goes 750k Scovils. I also have bags of fresh habanero and Thai peppers that I buy at Asian markets. I cut them up and mix them in food--particularly rice, which tends to be bland otherwise.