> Publication charges for authors and students will probably rise for a factor of 2 or more... open access journals in technical fields are approaching $500 per page.

There's a charge comparison table[0]. Prices are going up, but they'll be lower than the previous AAS Journals Open Access premium. Their sample paper prices are $60-225 per page (because AAS journals have "quanta" charges, where a quanta is a set number of words, a figure, etc.).

https://journals.aas.org/oa/#charge_comparison