If you are looking to save some money on CGC submissions you owe it to yourself to look at using their pre-screening service.
CGC requires a minimum submission of 50 comics to use the service. You can set any grade level you would like up to 9.8, and they will fully grade the comics that make the grade, and charge a small fee for those that don’t. If you are submitting modern comics the total fee will be about $375 including return shipping if half your books pass.
This service works especially well with modern comics. Overall you save a little money on the grading fee and ensure you get high enough grades on your comics (think 9.8) to make slabbing worth the investment.