This morning I tried to take advantage of the "4 for the price of 3" deal on some Bridgestone RE003s before the end of financial year (and the sale ends).
The retailer looked up the size and gave me the bad news about a widespread covid-caused manufacturing slow-down causing tyre shortages, with unpredictable supply etc. No 17" Forester Bridgestones for you!
I was offered longer-lasting less sporting options which were in stock.
I don't know the story with common Liberty sizes, but perhaps be aware of the issue and note that you may not be able to get your preferred tyres exactly when you want them.