3 months is an unusually long notice period so indicates a skill set or experience that takes a while to recruit? 3 weeks to advertise, 2 weeks to read the applications, short list and interview, another week to offer, that's 6 weeks gone. Then if the new person has to give 3 months notice to their current job, the employer is already 6 weeks without anyone.
If that's not the case and you're easily replaced then walk, there are loads of unskilled jobs available at the moment.