I work in Jewelry at Jared and most vendors don’t carry titanium, tungsten, or stainless steel in any size higher than 13. I also would recommend not going with titanium because if your husband is ever involved in an accident, titanium can not be cut off. If you need a 13.5, your best bet is to get white/yellow/rose gold. It’ll have a longer life to it and can easily be maintained
Like someone else mentioned, check out a local jeweler. That's where FH got my engagement ring, and we just bought both of our weddings bands 2 days ago at the same location. They had great prices because there wasn't those insane mark-ups you see at places like Zales, etc. FH also got a thinner band- I think 6mm- black titanium. He loves it!
I got my fiance's ring from blue nile as they had more options and reasonably priced.
He got mine from James Allen which was great but they didn't have what my fiance wanted. I got him a matte platinum ring that was 5mm but thinner in height which not all the sites gave height so I really liked that blue nile did. They had black ones too i know that.
I saw the ones on manly bands and they had the most alternative rings which was awesome. I almost got him a meteorite ring as that was what he wanted but after we shopped together turns out he wanted to ring matte one on blue nile so that is what we picked and it was cheaper than all the rings on manly bands which I was happy with.