Yes it is being sold in many places in the US, but I would imagine it would depend on the area. To become a distributor, you have to buy a train box car load. Smaller dealers will buy from those guys. I have a distributor about $100 miles from me that will deliver, but I need a decent order. I have a dealer here in my own town just 15 minutes away. I know this does not help you, but just trying to show that there could be someone with the panels close to you.
The best way to find out to to contact Okaply through their web site and ask for the nearest distributor. Just to let you know, I am not crazy about their plastic splines. The part you see kind of clips into either a groove in the panel itself, or a second receiving trim piece. The receiving trim pieces are just for the edges, the ones pushed into grooves are for the two 16" o.c. truss/staple area. Anyways, they kind of hang down just a fraction of an inch. I can see where the ones just pushed into the groove of the panel could loosen up over time and pop out in places. These panels are also softer and more fragile than the old (Mannington) factory panels. They are still easy enough to install, but you have to be real careful.
The last ceiling I did, I opted to forgo the plastic trim strips, which are like $8 each. 4 per panel, so $32 and tax. I used 1-1/2" flat screen trim. These were just straight grain flat trim. I covered the 1" staples up with them and caulked and painted them. Looks great. (see below) Actually, I primed and painted the strips out in the carport, then installed them with a 5/16" construction stapler (screws or ribbed nails could work), then spackled and touch-up painted them after installed.