Psy-Ence III is 188 pages. The six pages featuring Mario, Luigi, Sonic, and Tails is a spoof titled "Phantasy Star VI". That part where a Gundam appears in the book is a single panel on one page, and since I can't read Japanese I have no idea why it appears there. The rest of the book is purely Phantasy Star.
I'm kind of curious as to what sort of commission fee's your contact is charging you. Mine slashes her "per item" fee in half when I buy more than one item from the same seller, hence one reason I tend to get a bit carried away with my buying.
The memory card that I ordered is the Dreamcast 4x PSO Edition memory card. Already have a new PSO: Episode III GC memory card in my collection.