Well, you may think it's expensive but the Bowens version is £56.98 including postage from WH - and that's for a much smaller model...
But do you really need a 65 deg reflector anyway? It has a very high level of efficiency (about twice the efficiency of the Lencarta standard reflector) but if you can live with the efficiency and angle of the standard reflector you'll save a lot of money, and the honeycombs for it are cheap too.