The online Apple Store often offers small (~$100) discounts on iMacs on Black Friday. If the new ones come out before then, he might want to delay an order just a bit.
Oops ... sorry for the accidental reply to an old post.
The SE/30 was current from January 1989 to October 1991. There were several modular Macs out during that period. These provided varying numbers of Nubus card slots.
Macintosh II (March 1987 – January 1990)
Macintosh IIx (September 1988...
It's a bundle: for $300, you get the Touch Bar, four Thunderbolt 3 ports, and a somewhat faster CPU. (Faster in theory, but most people probably would not see the difference unless they were running very time-consuming batch operations.)
There doesn't seem to be a way to get four Thunderbolt...