Is fifty pounds a month reasonable for Krav Maga lessons?

I have studied marshall arts at various stages in the past (TKD,BJJ and Judo) and found their prices to be pretty reasonable. I stopped going after my daughter was born and am now looking to get into Krav Maga. I found a really good high rated gym but their wanting �50 a month for four days training and it seems a little steep saying as I already pay a lot to my regular gym and support a family. SHould i look into more down market courses or can I expect this sort of ball park everywhere?