I guess pretty much any bread knife is a bifl one, but in the twenty odd years i've had this, i keep thinking to myself that this knife is awesome basically any time i use it. That's why i want to recommend it. When I bought it it was quite cheap too, does not seem to be the case anymore. Is a Victorinox 5.2930.26
they have been making these knives for so long that you can probably find it second hand (pawn shop? thrift store?) for a couple of … your local money units
French person advice : idk how widespread they are internationally, but Nogent*** (also called "Nogent trois étoiles") has a good one for half the price. My dad has been using one since before I was born, and the guy literally can't live without bread.
Incroyable ! Je ne m'attendais certainement pas à ce qu'un anglais soit installé là-bas, parce que si je me souviens bien, économiquement c'est une des pires régions du pays. Mais la nature y est magnifique.