I bought into the plan and just now purchased enough books to earn the $5 credit.
They just sent an email and personally congratulated me, because the email mentioned "Your credit" - and that would be
me not you, but
me!
Here's what I bought:
1) Resistance - Julián Fuks [Charco Press]
2) The Distance Between Us - Renato Cisneros [Charco Press]
3) The Peaslee Papers: A Lovecraftian Chronicle - Peter Rawlik
4) Hardboiled, Noir and Gold Medals: Essays on Crime Fiction Writers from the 50s through the 90s - Rick Ollerman