"Everyone who is a monthly donor by Dec 1 will get a SPECIAL FR coffee mug for Xmas! If you sign up for $20 or more, YOU GET TWO!"
The way I read it, any FReeper who is a monthly donor for any amount by December 1 gets a coffee mug. Only those who are in for a monthly donation of $20 or more will receive two. Is that what you meant, Bob? Or is $10 the minimum?