Purple seeds

[DKOC91]

I was talking to someone earlier who said he knew someone who had some seeds and then he told me that the seeds were purple and was asking for $50 for 10 seeds. He told me they were sativas too. So my question is, has anyone ever heard or seen purple seeds before??? And do you think $50 for 10 of those purple seeds are a good price?

Thank You for any responses.