Comment by linker3000

Yes, all parts are still available although some are getting scarce/expensive. There's a UK chap who occasionally makes replicas:

https://twitter.com/Devilish_Design/status/10881650262786621...

If you want the experience without the cost, there's a 6502-Arduino hybrid you can build:

https://hackaday.io/project/26234-apple-1-mini

https://github.com/tebl/RC6502-Apple-1-Replica/tree/master/R...

The bare boards often come up on eBay.