2003 vw dip stick funnel, thermostat, and coolant temp sensor

Just before my daughter left town to her new assignment the top of the dipstick funnel broke off as I was checking the oil in her bugg.  Then the check engine light came on. She located a dealer whose parts guy discussed the funnel and then promptly ordered the dipstick.  (They're not going to charge her for the dipstick they received!  How thoughtful.  Maybe she should charge them for the Saturday morning she reserved to go have the funnel installed.)  They reordered the funnel for $15 plus installation(?).  The engine light diagnosis was $115 + supplies = $143.17.  The thermostat and sensor will run $461,including installation.
Are these prices out of line?!
I'm very auto/mechanically orientated but she's 300 miles away.  I'm going to visit next week.  How easy is it to fix these three items.  
It's not all about the money either.  As you know first impressions are very important.  They failed with the simple task of ordering the funnel so my confidence in their ability is off on the wrong foot.  Maybe they're taking advantage of a woman and her powder blue convertible bugg.
Thanks.  
Gerard1  

Hey everyone!  Thanks for NOT answering me.  Now some advice on the dipstick funnel.  The old one seemed to be dryrotted from heat.  Luckily the rest of it broke off way above the actual moteur metal  dipstick  hole.  So then I vewwwwy carefully stuffed a piece of rag down into the tube as far as I could with a thin blade screwdriver.  I was sure it went in beyond where the remaining funnel sleeve slipped over the metal funnel into the moteur.  Then I tapped the remaining tube peices with the blade of the driver and it broke off around the metal tube.  Some little pieces fell into the metal tube but were captured by the piece of rag.  I just grabbed them with my extension parts grabber.  When I pulled the piece of rag out the plastic sleeve left in the tube slipped out with it.  Next time I'll just chip all the plastic into pieces and suck them off the top of the rag with a shop vac with a piece of small diameter tubing sealed into the end of the vac hose.  Just seal around the tube with duct tape and you'll have a very flexible high suction unit.  (This method works great for cleaning out cylinders when helicoil threads need to be cut.  I cover the vac hose just behind the end hose attachment with an old nylon stocking so I can capture all the cuttings to see how much has been removed. When no more cuttings get sucked out you can be pretty sure there are none left in the cylinder.) Anyway, I guess it's a good idea to make sure no pieces of the funnel fall into the oil reservoir.  However, if any pieces fall in I suppose you can get to them by changing the oil.  They might flow out of the drain plug hole.  The funnel pieces sink in the oil.  (What kind of oil pickup unit is in these junky cars?  Would it direct any pieces through the filter so they wouldn't damage any parts?)
teh new funnel snapped right on.  Voila!  
Now, any advice on the location of the thermostat and coolant temp sensor and how to replace them to save my kid $5oo?