Re: EPGY.
1) Use Open Enrollment option. There is no tutor available, but it is 10 times cheaper - $135 / 10 months. You'll need a volunteer group administrator - you can find one here or on WTM.
2) EPGY has 'gifted' setting which is OFF by default. Setting it to ON reduces repetition of the problems greatly. It may make a lot of difference in your child's experience (you'll need to see which is better for your child). Your group administrator will be able to change it.
3) In EPGY OE, you'd be able to move your child .5 grade up or down in each available course (Math K-7, Algebra 8, ELA 2-7) on your own.
4) EPGY math has timed drills ("car races") at the beginning of each lesson, which can be skipped. DC went from being sometimes frustrated to being ok with these over time. I take it as a good sign. (I do not care whether DC does these at this point.)
Overall, IMO, EPGY OE Math and AOPS are the best products for math: EPGY for standard math and AOPS for deeper understanding and a different learning approach (problem-solving and discovery). They both provide complete (though differing) curriculums.
Re: CTY.
CTY seems to use third-party courses for many of its science classes, most notably ThinkWell. You can get ThinkWell for a fraction of the cost through
www.homeschoolbuyersco-op.org. E. g., HS science courses are $150 / 12 months, and half the price during the 'group buys'. As with EPGY OE, it would be with no tutor. A few people here (HowlerKarma in particular) have posted quite a bit about CTY/ThinkWell/online courses in the past (thank you -it was useful). IMO, ThinkWell HS science courses are ok, but not great. (No definite opinion on MS cources.) I am finding other resources which I like more - e. g., Hoagland's "The way life works" (not to be confused with David Macaulay's books) and Campbell's "Biology" textbooks (there are 3) a lot. Of course, what works better would greatly depend on your and your child's particular situation.
ETA: at 7 yo, DC loved 'Great Source' math books: 'Math to Know',...,'Algebra/Geometry to Go'. These are more like reference books than textbooks - which allows the child to jump to much further topics and back - this could be more interesting for your son.
