There are a few small displacement retro bikes on the market . The Royal Enfield looked good , but they changed them last year from carb to fuel injected and I think they lost the kickstarter too . A few years ago they were priced better , around $5 grand , now they are around $ 6500 . Don't see many used ones for sale.
I missed the boat a couple of years ago, there was one for sale that had a Kawasaki W650 engine swapped into it . I was negotiating price and lost out.
I think with insurance rates going up all over simple small (er) displacement bikes will make a comeback here eventually . The rest of the world has a better selection than we get here .