Ticket Tailor is an online ticketing platform with no per-ticket fees. Instead it's a monthly fee from just $25 (or £15) / month (and I'm the founder). It's really easy to use, you can embed your box office in to your website, and it works with PayPal and/or Stripe for taking payments so you get paid directly. Check it out: http://www.tickettailor.com/rf=clfm