I'm not aware of any. Gary McKinney had some mighty fine Silver Laced LF Cochins. When he sold out, I believe I heard Superior Farms bought them. I'm sure you'd like to save yourself the steps of breeding out the Columbian gene, but it'd be a start...
Yes, there are. I bought some silver penciled eggs from someone off Ebay last year and hatched them out but someone wanted to buy them, so I sold the chicks. The seller was from Maryland...that's all I remember.