80x60 is standard queen size, so any place that sells bedding should have spreads that fit. I'll add these to Mr D's list: Kohls, Macy's, Sears. Also Amazon, Ebay, Wayfair, etc. What you like is a matter of personal choice, as is the price & quality.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC