Ktopper, you may be close to correct about the NFs. The NFs are fairly new and most of the GR Bass cabinets sold in the states have been the AT series with a few of the wood cabinets.
GR's distribution system in the past had some shortcomings. They revamped their distribution network earlier this year, and we are starting to have dealers with inventory.
I have an NF115 on order and expect to see it in the next few weeks.
I currenty have an AT212 cloth front and had the previous AT212 metal front. (They sound the same. The cloth front version weighs a few pounds less and has no tolex.) I have not tried the AT210 yet.
I would say that almost no one has had both a 210 and a 212. The GRs were too hard to get and you were lucky to find one cabinet. Most people seem to have a 112 or 212.
Now with the new distribution network in place, you might be able to find a dealer who has a 210 & 212.