How do I filter out items on DnDBeyond that have no cost?

I’m trying to filter equipment items on DnDBeyond so that only items whose value is between 1 cp and 1 gp is shown.

The problem is that this is giving me a lot of items that have zero cost. I tried the entering the following values for the minimum cost but none are valid:

  • 1 cp
  • 1 copper
  • .01

I can’t find any sort of key that helps with this. Is there a way to filter out items without a cost and what is it?