However, I noticed that as a Costco member, they also offer HVAC services, including the same product line (Lennox), along with a 10% Costco Shop Card if you go through them.Has anyone here used Costco for their HVAC needs?

Some of those facebook groups have thousands of members.

Also, thanks @Scott Trench for your sticky post in the new members forum; I was intimidated about posting here, but your post encouraged me to do it (and tag you)! 

I recently paid off about 2 acres in Texas that I was able to purchase from a family member.

Best thing you can do is do some research to find a seasoned real estate agent in your area or use Bigger Pockets to ask other members who they had sucess in using. 

Given my circumstances, asking any of their family members to co-sign on a mortgage loan feels like a tough ask, as I wouldn’t want to place that kind of pressure on someone.

., HVAC tune-up, plumbing fixes)Deep clean entire property pre-listingEstimated Cost: $5,000Total Estimated Renovation Cost: $145,000Project TimelineWeek 1-2: Planning and DemolitionFinalize design and materialsObtain necessary permitsBegin demolition (kitchen, bathrooms, floors)Week 3-5: Structural and Major InstallationsInstall new cabinets and countertops in kitchenComplete bathroom tiling and vanity installationRefinish or replace flooringWeek 6-7: Painting and FixturesPaint interior and exteriorInstall lighting, hardware, and plumbing fixturesWeek 8: Finishing TouchesLandscaping and curb appeal updatesDeep cleaning and stagingTotal Timeline: 8 Weeks*This link comes directly from our calculators, based on information input by the member who posted.

You’ll learn a lot from others’ experiences and get answers to specific questions.2.Use the Networking Feature: Connect with other members in your area or those with similar investing interests.

Tax shelter schemes, partnerships with foreign partners and accounts, partnerships with hundreds of members, returns with blatant mistakes, entities in questionable businesses, like gambling, drugs, online video sales, escort services.

If I were you, I'd pass on this property and look for something else (and I suggest a 3 BR) under $80 that you can put a little rehab into, unless insurance pays your family member a bunch of money and they accept a much lower price.