In addition to (or possibly even instead of) a tutor, take a look at the online aleks.com offerings. Originally developed by UC California researchers aligned with California math standards, they do now offer courses aligned for other state standards, including a couple different "Integrated Math" curriculums.
A (good) tutor would probably be better -- but the aleks price is very reasonable compared to tutoring prices. It allows a kid to move quickly through material the kid is ready to move ahead on, and will map out what areas a kid doesn't yet have. So one approach would be to use aleks for what it can do well (e.g., fill in minor holes in background, let a kid quickly rip through new-but-easy-to-get material, quickly review material on which a kid is rusty) and thereby stretch your tutoring dollars by allowing the tutor to focus on those areas that need more explanation and development.
