After RentApp shut down I started using Buildium for my rental bookkeeping, which itself had all of the features of RentApp built in (but obviously you're paying a monthly subscription fee for the privilege of using said features). 

I have a subscription to AirDNA and I am a total newbie to this space.  

My main objective is to do a quick first pass over different properties.I know of a couple of sources, but the data isn't easy to work through:Craigslist - search for a zipcode, with 0 mileszilpy.com - but they have a limited number of searchesI'd be willing to pay a subscription fee if the data is easy to consume and accurate enough.Thanks!

I recently came across an awesome firm that even provides a "unlimited entity formation" package for RE investors if you pay an upfront fee (a few grand) and a modest monthly subscription.

I would recommend Airdna if you’re using the paid subscription because it allows you to see the comps they are using. 

I just personally didn't need to spend the money on the subscription as I was able to create a similar system myself.Hope this helps somewhat

it's also free under a certain amount of subscribers as you grow you will have to pay a monthly subscription (which should pay for itself through production).

How about other businesses expenses that are pre-paid such as dues, subscriptions, professional fees, etc?

I also have access to data through an online software I have a subscription to, which says the following:Original Loan Amount$268,700.00Loan Balance$268,700.00Judgement Amount$47,487.00Estimated Value$258,000.00Equity$210,513.00Where do you find out if a preforeclosure has equity and what the loan/mortgage balance is?

The BP subscription is well worth the price.