There are a few shops in Amed selling basic necessities as well as sarongs and T-shirts. It does not have the range of handicrafts and clothing that you find in other more developed tourist areas of Bali.
Surprisingly considering how much tourist is here, there are still no ATMs in Amed. The nearest is in Amlapura a 30 minute drive so bring some cash with you. In Amlapura there are two banks: BRI no ATM and Bank Danamon ATM, but only withdrawal of small amounts of money. Larger amounts can be withdrawn at the stand-alone ATM on Jl. Diponegoro at the Hardy's shopping centre. An ATM is coming soon to Culik.