Postcard Design

Design details: We are looking to have a postcard deigned that will be used in our deliveries for stock we sell on Amazon.
The idea is to drive people to our website directly rather then use Amazon. So we would like a nice deign which is in keeping with our website ad includes our logo. It should say something like:

Thank you for shopping with us, we have a much bigger range on our website at overhangclimbing.com and as a loyal customer we are offering you 15% anything you buy on our website. Simply use Voucher Code "thanks15" at check out to get your discount.

I am happy for you to play around with the wording but you get the idea, the deign should be double sided and in standard postcard size, ready for printing. Any questions please ask.

thanks
Ideas for the visual style: overhangclimbing.com
Extra notes: