Dan, My son has been running these on his CB since the Avons ran out. I believe Tim Voyer uses them as well.
https://twotyres.co.uk/product/continen ... tack-3-cr/He prefers them over the Avons and they don't seem to cut up as bad.
He just ordered a set from Chris at Two Tyres and they were here in 3 days. He has also ordered from MonkeyWorks in the Florida but you will probably get dinged with Carneys 25% Tarrifs comming from the US.
Pricing in the US and UK is almost the same. They may be 1 or 2 dollars cheaper in the UK.