>Graphene has really caught my eye in the last several months, but unfortunately I couldn't find a good deal for Pixel phones (>128GB storage), used or new. [...] I just finally switched from an S10E to a S25Ultra (black friday deal brought down to $820),

There are plenty of deals for pixels under $820: https://slickdeals.net/search?q=pixel&searcharea=deals&searc...