So my local Best Buy randomly got a shipment of 256GB space gray X's (the one I originally wanted) yesterday, so I ended up selling my 64GB silver and I'm stoked. Keep checking their site for store pickup and you may be pleasantly surprised!
Surprise surprise, I was going to submit the price match claim through Discover today, but I decided to just take one more shot on the BestBuy Chat (I believe this is like the 7th time... lol) and this time it's finally a success! I can see the refund on my order page now. Glad that I can get my $100 back.