Looking for round, foam chalk blenders (and Merry Greiger)

Hi gang,
About 15 years ago chalk artist Merry Grieger sold me a couple of round, high-density foam blenders. They were dark grey, about 4" across and 1" thick. I have worn one out and the other is looking pretty ratty. Nothing I have found works as well as what Merry sold me but nobody seems to know where Merry is. Can you help?

Thanks,
Kerry