I haven't been myself but I work for a well known UK tour operator and the prices we charge for Lapland excursions are absolutely eye watering. A 15 minute ride in a sleigh behind some huskies for example can cost around £150- £200 each.
It's very easy and much cheaper to book your own activities on Get Your Guide or Viator, just need to do plenty of research, there are lots of Facebook groups where people give advice and swap ideas about doing Lapland on your own, and you can save a fortune