old saying the pigs get fat.. the hogs get Slaughtered...
Just keep in mind that once you get a hydro... you need to get the tank o2 cleaned again. This is just my 2 cents and not law... Who knows what scum water they are filling your tank with. Just work with the LDS and ask them if they are also going to clean your tank. If the price is still off the wall, they are a hog and it's time to cut them loose and find another dive shop.
If you still don't like it. Then do what I did.. get the oxygen hackers handbook learn how to clean your own tanks (it's not rocket science) and get the tanks tested yourself and cut out the middleman.
As for not getting your tanks 02 cleaned. This can be a debate. Everyone has their own opinion on oxygen handling. For me I'm a DIY guy (not DIR!!) a DIY. For me.... it's just good insurance... sure you may never use nitrox or get your tanks filled partial pressure blending... but for $4 bucks worth of simple green & some materials its piece of mind. And after chewing the fat at my local hydro shop... I watched the Hydro shop put nasty beverage tanks, fire extinguishers in the machine before mine... you bet your @ss i clean my tanks after. I clean them, I know some punk kid at the LDS did not do it half baked listing to his I-pod texting is girlfriend.. Me, So when I hit the water.. the only person you can trust is yourself. And if I die.. It will be by my own hand.. (ok too deep)
I ran into some real dumb people at the mix station over the years. One guy held the analyzer up to the tank and dialed in the mix I wanted on the meter and not what it was
I guess what I'm saying is it's your money, you have a right for good service. If you don't like the service as i find with pretty much anything (not just scuba) you might as well do it yourself.
But if your LDS is a cool bunch of people, they will take the time explain to you what services you will be getting. And it is up to you to make the decision on which way you want to go. DIY, or just pay them for the service.
Some things in life are a no brainer.... After cleaning out my own boiler that left me black and hacking up black flem for 2 days... it's just easier to pay the guy... You know the deal, your an adult.. it's time to start applying this to scuba..