I was quoted $390 for a replacement strap for my noe bb (I don't actually need it - I just wanted it to have a crossbody option for my new-to-me multicolor petit noe), but for that price...I will just move the strap from one bag to the other when I want to wear it crossbody, it's not like I'll be using them both simultaneously anyway! I was really hoping it wouldn't be more than $300, but I guess that was just wishful thinking...
I definitely plan to replace the drawstring on the multicolor noe though, so I will update y'all when I get a quote on that!