John, Google Michelin slicks and you’ll see a number of distributors that have them available.
Here are the sizes available
https://www.michelinmotorsport.com/Tyres-Solutions/Auto-Circuit
Most folks run the 30/65-18 up front. Also, many are running with 18’s in the rear. Most common rear is the 31/71-18, I’ve used the newer/wider rear 33/68-18. If you want 19’s in the rear then your only choice is the 31/71-19 in Hard compound only.
Your looking at about $2500 for a set. If you search the web you’ll find some re-sellers who have good used Michelin slicks Good luck! Mike