It is easy to estimate
They post the entries on the website. There are also hotel rates posted. If possible you can cut that in half if you share with someone.
Travel depends on you
There are also back in costs
Table rental at $10 per hour but not required.
Food costs. Many take a cooler and or eat elsewhere.
Side bets and mini tournaments
Money for a shirt or pool accessory.
Many go for just a few days as staying for the whole thing and entering all the tournaments could easily be close to $3000 if not sharing a room.