Hey @solarcadet a few more 423 items to pick up:
The colored print is the "80 Years of Batman" print that Mondo put out a few years ago now. Hand numbered, limited to 250. 24 x 36, and very, very fragile in terms of the actual screenprint. If you end up with one, go over it carefully to make sure the screening has not chipped or scratched.
The Black and White Print is from the 2019 SDCC, and I think measures 18 x 24, and should come with a glossy cardstock 4 x 5 card with info about the print. Only available by signing up for a visa card at the con. I think limited to 350, but hard to find with sharp corners and no roll bends or creasing.