Where are you located? Here in the US they're incredibly rare and except parts that were used on other bikes that were actually sold in the US, you pretty much have to order from the UK. I had to order my BT-090's from thevisorshop.com and ship from the UK. Stupidly expensive...
My NC30 is actually an EFI conversion project running Megasquirt. I got tired of trying to get to the carbs... ;-)