Mr. Porter is a fairly new operation so it's hard to tell, but it's looking like they'll have big sales biannually right now. Similar timelines as Louis Boston - post Christmas and sometime in the summer. Mr. Porter is the most descriptive when it comes to actual measurements, which is why I love them.
On a sidenote, I do have one Hickey suit and it's OK. Too much padding in the shoulders but good fabric and fit for the price. If you can get one for 300 it's worth it, but don't pay more.
Not sure of your build but if you're in shape and thin to average build I would steer clear of BB. Their fits are much too full. Milano might be the exception but I tried a Fitzgerald, which they claim is more "modern," and still found it too baggy.