Singapore maths

I know a lot of people would say you don't need it for a kid already in school but I left elementary school about 30 years ago and what I knew then my kids don't know not because they are dull far from it but because the educational system I. This school is low, but since I can't homeschool or afford a private school I have decided to supplement their education and I observed they do well with me going back to revise their work time and again and after doing some research I discovered Singapore maths primary US edition might be a good fit but omg kudos to homeschool families it is expensive so here how do I get in a more affordable way , I know that k5 learning has free worksheets but it does not have bar modelling , challenging word problems etc so I don't know what to do , if you know another option pls help