I picked up another piece in my quest to complete the 2001 The Simpsons Mania! set from Inkworks. The set consists of 7 voice actors' and actresses' signatures and this fourth piece was had from eBay for less than two blasters. That's cheap from what I've seen and these don't even pop up all that often for the taking. While Nancy Cartwright (Bart) is the biggest name I still need the lesser-known signers tend to sell for more and may be short-printed to some extent.
Pamela Hayden voices a number of tertiary characters, most notably Milhouse, Jimbo, Rod Flanders, and Malibu Stacy.