There was a GrovePi, GrovePi-zero and lastly the GrovePiPlus. The latest round of GrovePiPlus seem to have only been produced by Seeed Studio, so I believe you will need to contact them for availability and distributors in your country.
Googling “GrovePi plus” lists many sources both Seeed Studio direct and many others.
If that’s the case, there may be little you can do firmware-wise. (Again, I don’t have a GrovePi board, so I’m guessing based on what I have seen.)
Cleoqc is a more definitive source, so it will be interesting to see what she says.
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Chip & Dip sells Grove-Pi+ boards for 4,700₽[1], (about $64 USD which is pricy, IMHO), but I may have to go get one just so that someone here will actually have some “stick time” with the beastie.
This way we’ll be able to do a tiny bit more than just guess.
Hmmm.  Can you layer a Grove Pi on a GoPiGo-3?  I wonder if it does anything for the Raspberry Pi’s i2c issues?  Can you use all the extra Grove ports for something useful?
I’m thinking that I should do some research on this device since we seem to be getting a bit of Grove traffic nowadays.  Maybe it’s because people being shut-in gives them time to rummage through stuff they had set aside.