those things called like rice crispies, sweet and all different colours? They came in a little bag about 20+ years ago.
I remember. Rainbow drops.
Yep you can, well in Norfolk anyway! I took my school to a festival in Norwich yesterday and rainbow drops were amongst the selection of high additive, high sugar stuff the kids (who probably never eat such things at home) were buying. I think you can get them in bulk at Bookers.