Your husband is being totally unreasonable imo.
It is outrageous that your husband values the chance to see Liverpool in the Champions' League final more than ensuring that he and his family spend a few days on a family holiday together (which in my opinion is priceless). What a stupid, stupid man (at least in this regard).
The chances are actually, that Liverpool won't make the final. I would usually prefer Liverpool to beat Chelsea, but in this case I will make an exception and really hope Liverpool lose this week.
Football aside, it seems to me that your husband need to get his priorities sorted out, as well as your finances. My guess is that if he goes to international matches he has a season ticket for Liverpool. That has got to be worth a few hundred quid. Fine if times are good, but when things are a bit tight, then surely it is one of the first things to go.
As children, my parents always took us on a holiday every year, regardless of what they could afford (no credit available then). One year we maybe went to a nice hotel in Spain; another year it might have been a caraven park on the south coast. We all loved every holiday. I remember once hearing my DF recount a conversation he had with another father where this man proudly proclaimed that he had not taken a holiday in 20 years. My father just said to him "your poor kids".
Liverpool will always be in some European final or another -- that's what they do. Your DC need to spend time away with the two of you.
Good luck (but not to Liverpool)! xxx
PS yes, your husband is an utter selfish prick.