Yes, I have had this happen. DD had a fav toy that went everywhere except child care. Hecta had an accident and was unsafe for her (she was about 9 months at the time). I knew the brand and searched high and low for a replacement to no avail. I ended up contacting the company who sent me a replacement (which turned out to be the wrong thing but DD loves it anyway).
It took me about 4 weeks to get the "replacement" from the company. For the first few weeks, DD was horrid. Wouldn't sleep, was clingy, wouldn't feed properly. All the fun things. She slowly got over it though.

We have another couple of "sleep toys" which I have duplicates of. These get rotated so I can wash them and not have her go through seperation anxiety whilst it is in the wash...

HTH. Good luck finding a suitable replacement.

MG