I buy my parts and nozzles from George Roberts (GR5) at thegr5store.com
He has lots of different nozzles and always seems to have cool new things that cause me to start impluse-buying. Don't know how many times I went to his site to buy two nozzles, only to leave with a half dozen items ordered. He's also excellent at responding to emails and questions.
If you're in the US, he's who I would go through!
You can buy and Olsson block kit which provides a new heater block for the nozzles to screw into and some nozzles of different sizes. I would also advise to replace the temp sensor at the same time as it is usually stuck in the old heater block.
Alternatively you can buy the UM2+ upgrade kit.
I would contact you're Ultimaker re-seller to see if they have them or you can get the from 3dsolex or one of their re-sellers.
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