My brother is getting married this fall and my future SIL is in a wheelchair. They're having a heck of a time finding a cake topper with a bride in a wheelchair. I've tried searching too and found a few with grooms in a wheelchair but very few with a bride.

Has anyone had any luck with finding a similar cake topper before?

I found this site, you can pick what you want, and yes, they do have what you are wanting.

Link is to the exact page to order it. Tell them I said "Congrats" I did a wedding cake like this years ago, couple were awesome.

http://www.magicalday.com/wedding-in-a-wheel-chair-bride-groom.html

Hmmm, I saw that one but the groom is in the chair and not the bride. It says ou can customize his hair, etc. but no option to swap places. Perhaps I'll give them a call and see if that an option they just failed to highlight. Fingers crossed!

How about this one!
http://m.enchantedyou.net/Wheel-Chair-Cake-Topper.html

I saw a lot of them online and can give you the links. I guess it depends on how prominent you want the wheelchair to be. I attached pictures of the options I found.

Some had no chair, and instead have the couple sitting.

I think the most important thing is finding a bride that looks like your future SIL. Let me know if I can be of help.