Anywhere from very cheap to stupidly expensive?
I would guess Naomi Universals working in good condition are 400+, rising steadily depending on their overall condition and what monitor they have, what the internals are etc.. (this applies to any cab purchase of course!)
Both your carts there will run on a Naomi (1) motherboard, but there is also Naomi2 (darker blue case) for if you want to run games like Virtua Fighter 4.
Just making sure you are aware you'll need a full Naomi motherboard, sound amp, SUN PSU and stepdown transformer to run the carts you have pictured!
Blast Cities are likely around £800 and upwards now.
Egrets, AWSD and the others are rarer so are now crazy expensive, at least £1000+
Ha, just seen you're in Leam. Have a pint in the Benjamin Satchwell for me will you
