I was able to find these on YT Music.

• Toaru Music List | https://youtube.com/playlist?list=OLAK5uy_mJbF9slyIVFCouv8eR5MI_NssR9nvFTmU
• Toaru OST 1 | https://youtube.com/playlist?list=OLAK5uy_k32PVHRfOoU6OVJu9Bs2V-AguXEng91Vg
• Toaru OST 2 | https://youtube.com/playlist?list=OLAK5uy_kgfawGVYb6slccVLo9BXVzJpniLwBGlnE
• Toaru II OST 1 | https://youtube.com/playlist?list=OLAK5uy_lW8cLyIJfFzQpgAkhSF2a2jSyOV5glmAk
• Toaru II OST 2 | https://youtube.com/playlist?list=OLAK5uy_l4nGUGvsZXm8w_JmWU6x5FwYhIV1psXOE
• Railgun OST 1 | https://youtube.com/playlist?list=OLAK5uy_k26PBWHyI7Adxik-VFYgNSxKel1HZktd8
• Railgun OST 2 | https://youtube.com/playlist?list=OLAK5uy_nXAQ8eDGPFPOkwgIwVUN6sJDIbraqXrpQ