Nevin Has an Electronics Store with a Focus on High-End

Nevin has an electronics store with a focus on high-end audio and visual products. He knows he cannot compete with the "big box" stores to attract everyone, so he has focused on people who demand high quality in their electronics even though some can't easily afford it. He has already used rebates, especially those offered by the manufacturers. He doesn't want to lower his prices as a large part of his customer base can afford his prices. What other discounting option does Nevin have that makes sense for his business and won't undermine the base price?

A) Price lining
B) Financing
C) Buy-one-get-a-discount-on-the-second purchases
D) Refer-a-friend bonuses