Cashback/Coupon Sites:
Get lower prices even without bulk purchases. Become more price-competitive when using cashback sites (and sometimes coupons). Some have also browser addons/extensions.
Befrugal (also has add on extension)
Honey Auto coupon finder with extension
Offers (coupons)
Priceblink (coupons and more)

Gift Cards Services:
Premier Gift Club Provides Amazon, Walmart, Sears, Bed Bath & Beyond and other gift cards. Payment via personal international PayPal also available. Here's a Video on how to register and use it.

Credit/Prepaid Cards:
Payoneer MasterCard is ideal for non US citizens that dropship in USA. Some Sites -like Amazon- Don’t accept PayPal.

E-Commerce The Guerilla Way (Contact us for discount before buying)