Good news ! I’ve contacted a supplier of electronic components today and he still has some of the AC125 and AF124 (is the same as the AF125) transistors in stock.
The AC125 costs 3.2 euro each and the AF125 costs 4.3 euro each.
Since these are small and lightweight components, the shipping to USA costs 5.5 euro when the package weighs lesser than 100 grams.
So if someone is interested let me know.