If not, where can I purchase such list to do cold calling?

They are not used to the cold weather but like the smells of the mountains.  

When looking at tax delinquent properties, does it make sense to cold call property owners who have taxes 6+ months overdue between$10k - $25K, but have brand new (last 2-4 years) homes with highend modern finishes?

Nice and easy, however, I would expect him to ask you for a reason since you do live with him...so be prepared to give him the cold shoulder or have a real discussion about it.

Investment Info:

Single-family residence buy & hold investment.

Purchase price: $100,000

Cash invested: $20,000

In 2008 after the market crashed, my wife and I bought a foreclosed house for less ...

Maybe even cold call them.

Cold calling and befriending the seller.

First time investor here.  Been listening to podcasts and running numbers on potential "deals".  I feel confident in my ability to crunch the numbers if I have accurate inputs, but less confident in my ability to esti...

Eventually you will get tenants that war over the heat or cooling or who drain the hot water leaving the other unit with cold showers.

Ex: Door knocking, Driving for dollars combined with skip tracing, Cold calling, bandit signs, and visiting city hall to gather Tax, Probate, and property Liens etc.For a higher marketing budget you can implement strategies such as: Direct mail, voicemail drops, email marketing.Word of advice: Marketing is the heart of the business, you can either choose to dig with a shovel or dig with a spoon, but they will both get results.Hope this helps,Cheers!