Where to find a replacement lid for a Dansk pot?

In addition to Gammy’s suggestions, here are some more, having various aesthetic and budget recommendations:
• use a similar diameter lid from a pot you already own (check if safe for oven if you plan to use it there)
• buy a lid from restaurant supply store or online (won’t necessarily be of Dansk line)
• the splurge option - see if there is a Dansk pot with lid and same diameter. Buy that and use the lid each of the Dansk pots.

Lucky find!! I'd first look to eBay and keep checking back. It may take a year and you may need to compromise on color. Personally, I'm trying to track down glass Corningware Grab-it bowl lids!