I am looking into buying a duplex in Hyatt Park and wanted to get some advice on what contractors/suppliers I could contact that have investor friendly pricing for kitchen cabinets, countertops, and bathroom vanities.

Great to meet you.We source from four primary suppliers: Lowe's, Home Depot, Floor & Decor, and Amazon.

But it seems to me that referral clubs only real value is vetting suppliers.

Not to say that you'd pick crappy materials, but contractors with experience have manufacturers and suppliers that they know guarantee their products and that helps them know they can stand behind their work. 

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They don't rely on ONE supplier, ONE broker, ONE anything.  

Stability: Homeowners tend to stay in their homes longer than renters, which can create a more stable environment for families and children.

>How well do log cabins in the area tend to perform in terms of bookings?

In addition, condos tend to not appreciate as fast in value compared to single-family or multi-family homes. 

I own 12-doors in Detroit and 3 of those are rented to section 8 tenants.The best areas for S8 tend to be C Class neighborhoods.