my guess is children prepare for first confession and first communion in 2nd or 3rd grade so that class is lumped together and they all use the same book for a 1 or 2 year program. Most publishers sell packages with a 1st communion book, Reconciliation book and supporting materials so the price sounds in the ballpark for one of those packages, with possibly a small charge to cover a retreat, and it sounds like parents pay once for the whole preparation program for the 2 sacraments, rather than paying annually.
Sounds as if Confirmation is in 8th grade, the preparation is 2 years beginning in 7th grade, so parents pay one fee for the whole preparation program, rather than annually, and that there is one book or package for each student, usually sold with a text, journal and some supporting materials. Sounds like the additional charge is for the expenses for the sacrament itself, possibly a retreat, gown (?) and so forth. I don’t get the 8th grade individual enrollment fee, but at $80 sounds like a retreat or some other extra activities are included
I don’t think the “fee sheet” is about the stipend to the visiting bishop or other priests at all, but about costs of the preparation program and events surrounding celebration of the sacrament.