I saw an older message asking about Zin Port recommendations, and being that Zin Ports are one of my favorite wines, I thought I'd mention my absolute favorite.
I saw mention of Prager ports and Rombauer (both excellent) and many others, but i did NOT see any posts about Del Dotto's Zin Port. For me Del Dotto is hands-down the best (that I've had so far). They use their own high-end brandy in their Zin Port, and it really pays off. You will fall in love if you are a Zin Port fan.
If you buy a case the per bottle price goes down 20%. They sell full 750ml bottles.