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Edit - £26 posted. Only used on the turbo. Runs fine (but I now use friction shifting...).
Each sprocket is individual, so make sure you either have a steel freehub or have an anti-bite guard, and put sufficient torque into the lockring.Can't find it anymore, but it was this seller:
https://www.ebay.co.uk/usr/djm759Edit #2 - Looks like @cycleclinic will be able to build one:
https://thecycleclinic.co.uk/collections/cassette/products/miche-11-speed-for-shimano-individual-cassette-sprockets
I bought a Miche 11-21 off eBay. There's one where you tell him what you wants and he provides all the sprockets and spacers. Was something like £20.