Meaning, if he sells them to you for 80%, then he's either getting them for somewhere between free and 50% of their face value (because they are stolen or fraudulent). So how is he getting gift card so cheaply he can afford to sell them to you for 80% of their face value?
Here's the conversation where I ask him how he gets them:
[4/17/2015 5:34:30 PM] Me: How much would you say your limit is anyway?
[4/17/2015 5:34:57 PM] the e-friend : I don’t really have a limit atm but would need a day or so to increase the volume if you requested it
[4/17/2015 5:35:49 PM] Me: Would you be able to share more details about how that is possible? O.o
[4/17/2015 5:36:11 PM] the e-friend: Bitcoins are pretty difficult to acquire for certain people
[4/17/2015 5:36:24 PM] the e-friend: I can get Bitcoins very easily however, because I have access to a bitcoin ATM near my place
[4/17/2015 5:36:58 PM] the e-friend: People buy amazon gift cards from a store for cash and send me the receipt, their government issued ID, and a photo of the back of the card in exchange for my bitcoins
[4/17/2015 5:37:21 PM] the e-friend: I, in turn, make a small return
[4/17/2015 5:38:52 PM] Me: That. is. awesome.
[4/17/2015 5:39:19 PM] the e-friend: I take every step to make sure the amazon gcs are legitimate
[4/17/2015 5:40:00 PM] Me: Very appreciated.