Very similar experience here when trying to purchase. Internal links to item (USB-485) give 404s, clicking on cart gives 404s, finally got to the point where I could purchase and my selected shipping options (ship as they become available, NOT all at once) would not propagate to the final confirmation order screen (i.e. I was able to select "ship as they become available" but that choice was never reflected in the confirmation page to confirm my order). Adding a shipping address frequently timed out and wouldn't take hold, updating the address on my profile timed out multiple times and wouldn't apply.. I could not enter credit card information without my company's name as part of the billing address (using personal card and will file reimbursement).
It was all a hot mess. I initially called NI, and after being told the lead time on the item was a week longer than what was listed online, I put up with all of the above and fought through the 404s to finally place my order.
I cannot believe this is the public-facing website of a publicly-traded company that makes it money through the selling of goods, with a market valuation in excess of 4 billion USD. This blows my mind.
