Hi kichikoi17 and welcome to Reef Frontiers!!
Ummm, I think I'd give Barbie a call, out at Aquarium Solutions. If anyone knows where to get some, I think it'd be her. She's a sponsor, here on RF, and has had a lot of experience breeding many types of FW fish, as well as 1 or 2 Marine Species. I don't know if she'd have any Rotifers available, but I think she'd know where to get some, on short notice.