Check with your local ALSA chapter–they should have lots of suggestions. In Mass., our chapter works with a ramp company that gives pALS 50% off. We were able to make up the rest through local ALS grants, leaving us with a bill of $195 (on a $7,000 ramp). A cousin graciously sent us a check for $195 for the balance, though we could have paid it. Check with Compassionate Care ALS (if they have that in MD), too.
In Massachusetts, the state offers a home improvement loan program for making ADA-compliant improvements. It’s a very low interest rate, you can borrow up to $40k, and you don’t have to pay back the loan until you sell the house. Perhaps MD has something similar.
Good luck!