I've got a pot of orange and black ones brought over from the UK that I don't think I'll be using. Contact me on [email protected] if you're interested.
There is a new kitchenware shop openned in MoE. Almost opposite the Body Shop. I was in there last week having a snoop around. They had a Halloween themed section. I don't recall seeing sprinkles, but they had cupcake stands, cake toppers (flags), cookie cutters etc. You could try there if you're in the vicinity. IF you don't find any shaped ones, you could maybe use orange, purple and black sprinkles perhaps???