I'm trying to find some Wilson Combat/Vickers rear glock sights with the single tritium dot.  Everywhere I look is out of stock.  Does anyone have any recommendations on where I can get some of these?

I orderd two of the plane black Vickers battle sights from Wilson Combat early this month, they told me they were out of stock but expected more soon.
I placed the order, hoping to have them when I pick up my new full DE 35 and 23 on March 4. I got both rears plus the tritium front for the 23 and FO front for the 35 last week, WC has great costumer service and came up big, I was sure I'd be waiting a month or more after I picked up my Glocks. But I got my sights waiting on the guns.

Heinie makes straight 8 sights if you only are looking for single dot.  They are my personal favorite sights.

I like the heinie's but I prefer the U shaped rear sight cut out on the vickers.

Same here, although I have plenty of square notch rear sights in my armory whenever I replace sights now I always go for the 'U'. I just put sights on a gen4 21 and used the 10-8 plan U notch with the brass bead front sight.

It's proven that our eyes are drawn to sharp corners, with the U it puts your eyes at the top of the front sight faster. Where they should be.