It varies alot and depends on whether you're happy to wait for a lorry to fill up or want them brought over for a specific date. I have 2 coming over from the UK this month so there will be a lorry going back from Brittany in about 2 weeks. If you want details please feel free to PM me.
I will also be happy to tell you who to avoid like the plague, I've had lots of ponies brought over and the very varying standards (as well as prices) is shocking, sadly.
I imported 11 horses from france it was 1000 for two I used Loc who I may add were excellent. As these horses were nearly all unhandled been dumped in a field before I bought them then two months after I got them put on a lorry shipped to uk. All arrived safely if not a bit shell shocked.