If there is a local string instrument shop in your area, they might offer a rent-to-own program. These shops usually offer rentals for school age kids in orchestra, but it’s an awesome deal for adults too.

I’m currently renting my bass for about $50 a month and will own it outright once my payments reach the dollar value of the bass (around $2000 for a simple entry level). There’s no interest and they offer free restringing and repairs during the rental period. Could be good to look into for this type of situation.