Loads for sale online if you look but if you asking for free seeds then it's not worth the risk they could come from hermies or be males I always buy my seeds feminized and then I know what I'm getting good luck
If it gets cold enough they will turn purple. :)
Sadly I don't have any that are photo and purple.
could try ILGM for cheep seeds if your in the USA.
get what you pay for though.
Good Luck!