I've heard of some getting the second for $99, some getting it for $199, rarely anyone gets a second for free.
Your credit score may affect the offers they offer as well.
If you have AAA call through that number for $10 off for 24 months.
If you don't have AAA, get a referral and get $10 off for 10 months. (Let me know if you don't have any friend/family with Directv and I'll get you one).
Both are in addition to the regular promotion.