[URL unfurl="true"]https://www.ukdrills.com/morse-taper-shank/morse-taper-imperial-bit[/URL]
£5.28, but you'll pay P&P. Sometimes cheaper from the same place on Ebay.
I have their set of bits from 6mm to 10mm in 0.1mms which is good - it's often good to go a size under the recommended size.
I tend to stick to the same kits and have MT bits for them.