You are probably out of luck.
Seller funded DPA programs are ending this month and most sellers and banks are very hesitant to accept offers using it right now because if anything slows down escorw it will ended falling out of escrow due to time constraints.
Also, local DPA programs probably will not work as they are primarily for 1st time homebuyers.
Last, if you don't have equity in your current home and/or can not qualify for both mortgages on your current income (not rental income counted) then you may have problems qualifying. So many people went out and bought homes and then walked away from homes that second home loans are getting very hard to get without high FICO, high DP, and reserves. Also, unless you can prove income history from the "rental unit" they are balking at counting income from it. Seeing how you live in your home now it will be hard to show rental income on it.
Talk to a broker as everyone's individual situation is different.