Pre-made demi glace / Béchamel

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Just wondering if there are good places to get pre-made demi glace or Béchamel sauces? Most french sauces build off of those, and they're usually time intensive to make from scratch. It'll be really convenient if I can get those pre-made and then enhance them into the final sauce myself.

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the only time consuming thing about making a bechamel sauce is cooking out the starchiness which only take 15 minutes or so. and with a demi glace, best thing to do is make a veal stock and then reduce it down to a glace (de viande) and then freeze it into ice cube trays. that way you are only making it once in awhile and then when you want to make a dark sauce, pop out your frozen glace from the ice cube tray and add it to your reduced wine or gastrique or whatever.