Just a heads-up for anyone else who’s shipping from France: La Poste’s tarif courrier is changing from 1st March. Most prices will increase by just a handful of centimes, so n’inquiÃ©tez vous.
A 20g lettre prioritaire increases from 54c to 55c; 50g increases from 86c to 88c. 250g and 500g are up 7c. There are also two new types of Lettre Max: 20g and 50g (as well as the current four size-limited packets), which are a rather reasonable €1,85 and €2,25 if you buy more than one at a time: those certainly deserve closer investigation for sellers of little things (though equally, they might presage greater strictness on the contents of a “lettre”).
For international prioritaire, changes are a little heftier at the lower weights: packets up to 50g increase 5c, up to 100g increase 10c, but over 100g there is no change.
All in all, not too bad: you can see all tariffs on La Poste’s website.