Yes! You can order DIRECTV NOW whether or not you're an AT&T or DIRECTV customer. DIRECTV NOW is a separate service that is billed separately from any other account. You can even add your DIRECTV NOW account to your existing AT&T Access ID when signing up. This way, you can manage all accounts with a single ID.
For pricing options, plan comparisons and to sign up, please visit DIRECTV NOW. Once your account is created, you can stream immediately.
Note: Existing DIRECTV satellite customers that are under contract term agreement must fulfill that agreement to avoid penalty or early termination fees. Promotional pricing and/or bundle discounts may become invalid with the removal of DIRECTV from the bundle.