We also have a Tripp Trapp - there are loops for proper reins, so it's a 3-point harness, but can be removed when that's too "babyish"!
We got ours from backinaction.co.uk - think it was £112 inc baby set and cushions after I found it cheaper than they were doing it somewhere else (Lullabys.co.uk maybe?) and got them to pricematch and take a fiver off, as per their promise