As an addition to our Timekeeper NV-RAM chip FAQ article, CD-i member Erik Jacob posted an valuable link to let us know where to buy brand new Timekeeper chips for your CD-i player. It seems these chips are still in active production, so you don't have to be afraid of long storage periods or that you will buy from an old stock. Erik Jacob: "I'd like to correct you on the availability of brand new timekeepers. According to STmicroelectronics' website, the M48T08 series of timekeeper chips are in active production, and can be bought online either directly, or from a distributor, like Mouser Electronics (where I got mine). They are brand new, as in still manufactured to this day."
Buy your brand new Timekeeper NV-RAM chip here
Check the Timekeeper NV-RAM chip datasheet here.
[Thanks, Erik Jacob]