Here is a fantastic copy The Legion Of Super-Heroes #298 CGC Graded 9.8, with White pages. The Preview of Amethyst Princess of Gemworld, 1st appearance of Dark Opal Granch, Carnelian & Amethyst (Amy Winston)!  It shows beautifully! There are a few very light scuffs on the slab.  Price is $170  buyer pays $20 USPS premium ground shipping.   No Returns on Graded Comic Books. 
PS: I do not ship OUTSIDE THE CONTINENTAL US!