Firstly there will be a fee for playing over the weekend. This is typically around £25-35 (or £13-18 per day, if you only play one day). This is directly related to the overall fee to be paid by the team to enter the tournament so these fees vary from tournament to tournament.
Secondly, there is the travel cost. We usually drive to tournaments and car share, so maybe that’s another £5-10, depending on where the tournament is. Just split the fuel costs with your driver and other passengers. (If you are the driver, politely ask for a contribution.)
Finally, if the tournament is further away, you may wish to stay overnight. There is often camping (usually free), but you may wish to stay in a cheap hotel or AirbnB. A good few of the tournaments that we will look at are in Farnham Park or Swindon, so people will usually commute to those both days and only the party animals camp over.