Currently there is only the print edition, which is quite expensive. However, there should be a digital edition like the other books. Also, keep your eyes open for sales, like on New Years and other similar holidays (like here).Wisdom Publications wrote:Brilliantly translated by Bhikkhu Bodhi, this anthology of suttas from the Saṃyutta Nikāya takes us straight to the heart of the Buddha’s teaching on liberation through the four noble truths and the noble eightfold path—the two mainstays of Buddhist doctrine that illuminate the nature of things by generating direct insight into the teachings. These suttas all pertain to the ultimate good, the attainment of nibbāna or liberation. They illuminate the Buddha’s radical diagnosis of the human condition—and more broadly, the condition of all sentient existence—in light of the four noble truths. They underscore the pervasive flaws inherent in the round of rebirths, trace our existential predicament to its deepest roots, and lay out the path to unraveling our bondage and winning irreversible release. Ven. Bodhi arranged the chapters, each with its own introduction, to provide an overview of the Dhamma that mirrors the four noble truths, thus enabling students of Early Buddhism to see into the heart of the Buddha’s teachings as directly and clearly as possible.
For those interested in the Pāli language, Bhikkhu Bodhi provides linguistic and grammatical explanations of the suttas included in this book in his Reading the Buddha’s Discourses in Pāli.