[superlex]

Credo siano referral coupons:

A referral discount is exactly what might tip a potential customer to make a purchase – especially when backed up by a friend recommendation. The friend offer or referral offer is the incentive you give to referred friends and new customers to make their first purchase at your store.

Se ne trovano un po' in giro, anche se la maggior parte scaduti.
Grazie Bokka