It's a bit early in the year, but try looking on Leboncoin. A nuc will cost you about 80e for 4 or 5 frames (depending on the seller). Also depends what type of hive you have, as you will most likely be offered Dadent frames.
If you keep bees in France you should have registered to do so. Contact your assoc and see what advice they can offer as to another local beekeeper who might be able to sell you a nuc later on in the season. You could also ask your mairie if he knows of any beekeepers in the commune.
Meanwhile, do you have any other colonies you could make a nuc from in due course?
Why did both colonies die? Remember to reduce the size of the entry of the hives over winter, put your mouse guards on, and make sure they have enough stores going into the winter. Next year also give a sugar syrup feed at this time of year, as they are starting to fly but not much forage out there yet, so they are in danger of running out of stores having made it through the winter.
