Begin your search by seeking out "Schrammelmusik" - be aware though, that the guitar used in Strauss' quartet was most likely a contraguitar with added basses. Contraguitars are still quite common and may be picked up very, very cheaply - even originals go for as little as £500. By chance I have recently ordered a later one (c.1920) - rosewood back & sides, spruce table etc., cost only £650.
Schrammelmusik is still performed today though the clarinet is often replaced by the accordeon: https://www.youtube.com/watch?v=RGU7MhlhXfk
If you search for some of the modern bands you might be able to track down a few scores.