Mathematician Betting are running a 2 for 1 deal this weekend.
Buy the Saturday Horse Racing Analysis and you get Arc De Triomphe Sunday
as a free special bonus.
There is more info here
There are some interesting Arc De Triomphe Stats on that page which may be of use to those of you who like to pick your own horses. They are from 2014 but many will still have a degree of validity this year for knocking out and shortlisting.