I've been trying to re-order this week but have been hit with apparent part shortages according to Apple's website. Gives me a bit more time to decide I suppose. At first, I noticed that ordering a 1TB SSD would jump the 'available to ship' timeline from 1-3 days to 4-6. That's back to normal now, but upgrading the RAM to 16GB is now showing 1-2 weeks. Is this normal? I assume it's just a case of Apple not having enough supplies for production of certain parts. I'm on the U.S. online store if it matters.