Sent email to angelinajolie@studiofanmail.com on February 3. Received a pp on March 28.

Sent email to edharris@studiofanmail.com on February 5, got a nice b&w picture, (pretty sure it's a pp) on March 28.

I like the picture so I'm pretty happy.

I think if you try the United States Postal Service website you can order US stamps there with your credit card. I haven't done it myself but will try later this week. Hope it works out for you and good luck.