www.ctshirts.com/windsor: http://www.ctshirts.com/windsor
has all the details.
This is the deal people are usually waiting on, doesn't get much cheaper
than this. I think the AMEX restriction is new, but it let me pick my free
tie before I included payment info so maybe you can get away with it? Their
phone CS is great if you have any issues.
One fitted non-iron shirt + tie was $39.50 shipped for me.