NewEgg Coupons or Promo Gift Cards with select Sennheiser headphones (HD 202 II, Momentum In-Ear, HD 518, etc)

NewEgg has a two part Sennheiser promotion expiring at the end of day on 5/30/15. The first part are promo code discounts that can get you the HD 202 II for $15, the HD 439 for $40, the HD 518 open-back for $60 among others. The second part are promotional gift cards ($10 to $50) when you buy some of their newest headphone models (RS195, M2 AE2i, Urbanite XL, Momentum In-Ears, etc). The Momentum In-Ears go for $100 with a $20 promotional gift card, which is not a bad price, but the offer only applies to the red color scheme for Galaxy/Android.