You can buy Eridu Arcane albums at the following places:

iTunes music store
Download the album at iTunes.

Cynfeirdd
Contact Cynfeirrd for wholesale orders.

Shadowland
Shadowland accepts payment on delivery in Norway, and is recommended if you are unable to pay with a credit card.

Gompa records
Gompa records accepts all major credit cards.

Trimail
Trimail is a German mail order outlet.

Middle Pillar
Middle Pillar is an American mail order outlet and distributor.