The two POCO's we deal with have an approved list of meter cans. If you don't use one of the approved meter cans they won't hook up the service.
For the most part the lists are the same or very similar, but there are a few exceptions.
I'm sure your POCO has other manufacturers cans that are approved, but you'll need to check with them.
Most of the 200 amp bypass cans are 3 phase or single phase, that is probably why they are so costly.