If you were looking for something special for Father’s Day, or just considering the purchase of an ereader for yourself — this week may be a good time to purchase a Nook. Barnes & Noble has temporarily lowered the price of the Nook Color and the Nook Simple Touch readers. The sale means a $20 discount, but does come with a slight catch. In terms of the deal, the Nook Color will be $149 (down from $169) and the Nook Simple Touch will be $79 (down from $99). Now for the catch, in order to get the discount you will need to make the purchase direct with Barnes & Noble (either in-store or online) and using a MasterCard. Finally, the sale ends on June 17th.