Retail advice question: Where can I find comforters without all the other crap?

I’m looking for bright colored down (or fake down) comforters.

All I can find are sets—throw pillows, shams, bedskirts, and all sorts of other accoutrements that I have no interest in (and will throw away or give away).

Can you point me to stores that sell comforters singly, not as part of a set? All the places I checked – Overstock, Wayfair, Amazon, Target, WalMart – they’re all selling sets.