Thanks, Mike. I bought my current Mac Pro from Jigsaw back in 2007. I can't believe they've got stock while we're all waiting for CTO builds we ordered 38 days ago.
Jigsaw's Macs are 256GB SSD as I suppose the retailers have stock configs only but it all adds to the general levels of discontent we're all feeling at the moment waiting so long for our new toys.
Edit: Actually looking again, you might be correct about the 512GB SSD. The main heading on the page states 256GB but the specs further down the page have 512GB. Back in the day, Jigsaw carried whatever stock options were available at the time but that's some time ago now and looking at the other stock "coming soon" it does appear that they're going to have different configurations available than the stock versions offer.