Vols. 1 & 2 are currently out of stock but with the new show being out and the third volume coming soon I don't think you'll have to wait too long.
The Umbrella Academy, Vol. 1 https://www.amazon.com/dp/1593079788/ref=cm_sw_r_cp_api_i_RXfECbBNSSMM8
Amazon. Is Out of Stock, atm.
BN is not.
Volume 1: Apocalypse Suite
Volume 2: Dallas
Pre-Order Volume 3: Hotel Oblivion