Does anyone know where I could find ladies ballroom shoes in a size 11.5 or 12 narrow? Or if there is a place that custom makes shoes for dancing?

Try appledanceshoes.com I called them and it is like $20 more for any size larger than 10 US. Also, if you go to your local dance shoe store ask for So Danca they will make larger sizes but they have to be special ordered.

I wear a size eleven, so I know the problem! I've had good luck with Celebrity shoes. If you special order, you can specify size, as well as heel height and color.

One problem with special ordering, whether through stores or over the internet, is that you usually can't return special orders if the shoes don't fit. If they have anything in your size in stock, you could try those, even if they are not what you want, just to see if the size is right and fits your foot. Then return them and special order what you do want.

Two sources I've had good luck with are toe2toe and backbaydancewear. They both have websites and you can call them. They've always been very helpful to me over the phone.