A video done by a synth Diyer on transistor matching https://www.youtube.com/watch?v=RpptRXe60yw
Or matched pairs of commonly used 3904 or 3906’s are cheep enough, unless you are planning on macthing loads. Be careful as to where you buy matched pairs from, as not all matches are the same.
Matched Transistor Pairs – Thonk – DIY Synthesizer Kits & Components