$400 for extension springs??

Sorry for the length of this post -I have been having a problem with my garage door not wanting to go down and then when it does go down all the way, it starts back up.  I had to stop it and make it go back down again a couple of times before it would stay closed.  I called a garage door company I had previously used to come make adjustments (I thought it was an adjustment on the opener) and he told me it needed new springs.  At first he said I needed to put in the big spring over the door and that would be close to $1,000.  I said no, what about replacing the extension springs. That would cost $750, $200/spring and $350 for labor.  I said I couldn’t spend that much right now, what could he do to get the door to close and stay closed.  He said he would have to re-tension the springs and that cost $210.  I looked it up real quick and found springs for $20.  My son went out to tell him never mind, we would fix it ourselves and he was already done.  It had been 9 minutes.  Below are pictures of the springs and the garage door (the pictures rotated so are upside down).  It is a single door and seems to be in pretty good shape.  Is there anything broken and needing to be replaced? 

From the pics your door looks fine except for the springs. It looks like you just need to get a new pair of springs. Extension springs come in 10 pound increments so you want to make sure you get the correct ones for the door. For a single car non-insulated door the springs could be 120# to 160# springs...it all depends on what your door weighs.

The price the service company charged you is extreme. A new pair of springs installed by a technician including labor should be between $100 - $200.