DC #4 and #5 Promotion

We have modified our promotion for the DC New 52 titles, we have removed the 52 level and added a 5 level. So now you get 5% off at 5 titles instead of 10. Every other level goes up 5% in discount, culminating with 25% off at 40 titles instead of 52. The promotion applies to each specific month, so the # of titles per month.