Couture Cardstock One Sheet Wonder
I will say upfront that I may be biased because I work for the company, but at Couture Cardstock we have a product endorsed by Sally Lynn McDonald, Copic Education coordinator, just for Copic markers. It is called the One Sheet Wonder and the alcohol ink does not bleed through the back. It also blends like a dream. Copic uses it in their booth at CHA and in their education classes.
Hope this helps!