I sourced a replacement (about $50.00) and installed it in 10 minutes.  

Source: wholesalerPurchase price: 87kRepair: 10kLoan term: 5 year fix at around 5% with 20 year amoritizationRent $1275 - leased within 1 weekSimple and straightforward, no drama (rare).

Accepting known money from illegal sources.

Are you planning to use these as a primary heat source?

They are an absolutely great source of information.

Does anyone know of any reliable online sources for these specific leads?

Do your demo, source your material, and create a beautiful house… being sure to customize the house with your target market’s needs in mind.

A couple reasons off the top of my head why you may not be finding any rental comps:-No rental demand in the area so little or no property used for rentals-Extremely high rental demand...nothing is available (not likely)-Craigslist is not highly utilized in the area (thus rentals are not advertised there)-Pricing doesn't support rentals (ex. really high property taxes or insurance or high price-point purchases like $500K+)There are probably plenty of other reasons that could be the source of this challenge.  

If you would be interested in locating a source of properties for your flips, please contact me.

Oh yes, Craigslist is another source that I find others have had success but I myself have not find any deals on the site.