Ultegra/ 105 sprocket replacement

yaya
yaya Posts: 411
edited June 2012 in Road buying advice
Does anyone know where I can find replacement sprockets for Ultegra or 105 cassettes?
I've recently put a new chain on and it slips in 1-2 sprockets.
Sounds like a waste of money to change the whole cassette as it is in good condition so I wonder if I can buy just the sprockets anywhere?

TIA

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