All donations are sold at very low prices and you'll get a receipt for your donations for tax purposes.  100% of proceeds go to support Habitat for Humanity.Full Disclosure - I'm in the application process to serve as a volunteer on the local Board of Directors here in Central Maine, so I just might be a little biased!

You could also look into volunteering with Habitat for Humanity - that would be a great way to start building knowledge about home construction that will definitely come in handy.  

I also have been volunteering with a flooring company, a drywall person, and a house flipper who did the majority of the work himself to learn all of this. 

A repair allowance is one possibility, so don't volunteer to the next lender that the place is rent ready. 

However, I'm a major volunteer of Information Technology professional services to a local non-profit Christian school for the last 13 years.

We've installed the sub-meters and even had a tenant at one property volunteer to report the meter results every month for billing purposes.

Find a licensed plumber or electricians office and VOLUNTEER to work weekends or evenings.

My wife and I, not only donating thousands of dollars and hundreds of hours, received PTA "Parents of the Year" awards, my small business was a partner (funding "regular" lunches for students without funds) with the LB Education Foundation, and I was a volunteer athletic assistant coach at Poly High School.My recent records request shows that in the 18 months subsequent to implementation of SB 13 (Jan 1 2020 to June 30 2021) the LBUSD received 300 less-than 500 square foot ADU applications and received $461,000 in illegal school impact fees.

You can also call around to the larger churches, food pantries, or other volunteer organizations to see if they offer anything.

@Lamont MarableIf you have a specific skill set that may benefit sponsors, offer to volunteer for them.