Yes Xero has promo codes. Yes I sometimes know the active promo codes are. I’m only going to be able to help you with Australian promo codes. You can ask me on twitter at @HeatherSmithAU or click on my contact page and send through an email to me:
http://heathersmithsmallbusiness.com/contact-us/ and ask if I have a promo code that I can share with you. I might be able to help.