IMHO, ever since Richard Garriott got back into the limelight with his new not-Ultima game the prices of everything have gone up.
So yeah, this is going to get expensive for you and quick. I'd just stick with the GoG releases unless you really, really want to get everything physical they came with back in the day.
Hmm. Makes me wonder if I have anything though...
I have completed every Ultima game multiple times (I have them all on the 1-9 CD that came from EA back in the day) - it's the physical goodies I want. I'll lay out everything I have and figure out everything I'm missing to show you guys.
And yea, before March since I'll be speaking on a panel with him. Might ask for a signature or 9 while I'm at it.