Michelle, I’m getting to this post late. Hope you’re still around. Here is a link to a mint-in-box 7-dwarves set by Arcotoys on eBay that may be similar to the set you’re describing.
http://www.ebay.com/itm/SNOW-WHITE-AND-THE-SEVEN-DWARFS-FIGURES-Mattel-ARCOTOYS-INC-5184-7-DWARFS-/170911984843?pt=TV_Movie_Character_Toys_US&hash=item27cb25eccb

It’s a buy-it-now, so hopefully the link will still work by the time you see this. If not, just do an eBay search for Arcotoys Disney and you should see some results with pricing, though that’s not necessarily what they would sell for, new or used.

Good luck! 🙂