The Planetary Science Journal is endorsed by the DPS. All PSJ articles are open access as soon as they are published. If you are a AAS member, you may be eligible for a publication fee discount; if you are an affiliate DPS member and not a AAS member please note you will not eligible for the discount. If you are unable to afford the publication charges, due to a variety of circumstances, you can contact the PSJ Editor and request a fee waiver.
The DPS leadership pages include information about the PSJ editors.