Scrap is mostly available through Lodgings cards. The Bazaar lodging is particularly good if you can succeed on the challenge, as it gives four scrap alongside two echoes. The Brass Embassy and Royal Beth cards have three-scrap options and the Townhouse card gives two. The Lair in the Marshes has an option for one scrap, a Society Favour, and 1 CP Nightmares. Besides Lodgings, Calling in Favours in the Flit exchanges three Urchins Favours for 25 scraps and a Bundle of Oddities. For those who complete A Trade in Faces and choose the Curt Relicker, his card gets an option giving 1-4 scrap and a Suspicion reduction.