used but in good condition twin tips, thats an oxymoron isnt it?  anyway, i would suggest buying from a on hill shop, that way if you ever have any problems with you equipment, instead of having to take it back to the shop you bought it at, you can just walk off the hill and into the on hill shop.  they will already know you, so it will just make the job easer.  the other thing is, i see alot of people who dont get the equipment they need from off mtn shops.  employees at off mountain shops tend to be a little more uneducated and not have as much knowledge.  a on hill shop has employees that ski all the time, and know what they are selling.  then again, you might already know what ski is for you.  overall, prices should be compairable, so its really up to you.
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Matt Rihm
First Run Ski Shop
Stratton VT.