By the way, Audi E-tron modules are pretty much the same as the Ipace modules, so that gives another source.
Here in Europe there are some sources (which I think Zero EV is also using) that have a lot of these modules from factory where a batch is not approved or something.
Anyway, they are working nicely, and they are a nice form factor. No slave boards to reuse though, so just a seperate BMS.
I guess in the US it is maybe not that easy to get them. But they would be well suited.
These appear to be the VDA 355 format (size and shape) standard, but it's not a widely adopted standard so few production EVs (at least in North America or Europe) use it. Yes, both the I-Pace and any VW/Audi EV are less common in North America than they would be in Europe.
Zero EV also offers modules in this size from CALB, but in both 6S2P and 4S3P so fewer modules (and less energy capacity) would be used for the same nominal voltage... only two 6S2P modules for 4.4 kWh, or four 4S3P modules for 8.8 kWh. Even 8.8 kWh wouldn't meet the stated requirement for "16S and at least 200ah" (11.8 kWh @33.7 V/cell); in addition to the lower module count, these modules are rated lower in capacity than the same-size LG Chem modules in the I-Pace (and e-tron).
Electric GT offers
OX Drive modules, and the Energy line are also in this VDA 355 format, in 6S2P and 4S3P just like the CALBs from Zero EV so they still wouldn't add up to enough capacity... and they may actual be the CALB modules.
The VW e-Golf has used this format (and a half-sized variant) as well, but again they're 4S3P, versus the 3S4P modules of the I-Pace and e-tron.