This is partly because you can find Lanvin flats in all kinds of colors and materials, even though every Lanvin flat isn't produced every season. But there are so many different kinds of Lanvin flat shoes coming out, that they have even become collectables for some.
Net a Porter and My Theresa constantly have these shoes in store, but keep in mind that Lanvin ballet flats are not the only kind of Lanvin flat shoes you can find. Instead, there are also Lanvin sneakers and Lanvin trainers these days, and they can be a great choice for those who want a comfortable pair of Lanvin shoes too.
If you haven't seen Lanvin sneakers or Lanvin trainers in your local store or department store, that is not so surprising though, since they are a bit more rare than the Lanvin ballerina flats, but then you should be able to find a nice pair of Lanvin sneakers online.
Another great thing about Lanvin flats is that you can often find Lanvin flats on sale, but usually the most classic colors do not go on sale, which is important to keep in mind. So if you want to save money by getting Lanvin flats on sale, prepare to only have more unusual, trendy colors to choose from.
(pics from Jeana Sohn, Closet Boston and Runaway Chic)