Some of where you advertise will depend on whether you are looking for an investment collector or one who buys for pleasure alone. Advertise in publications that collectors read...American Craft, American Style, FiberArts, Art in America, ArtNews, Art & Antiques.
Talk to the folks at the Brush Gallery and/or Whistler House for ideas or possibly a showing that would get the pieces seen as art rather than craft. And, of course, be sure to put them on your website and maybe promote them to your mailing list. Collectors want to have a 'connection' to what they purchasee, so be sure to include the story behind the pieces you are selling.