Mouser has apparently CDN-blocked me from browsing their site. I can load the homepage fine, but any attempts to visit a product page give a denied message.
I emailed them about it and got a vague message back about "behavior patterns that resembled automated site scraping activity" and linking me to their paid search API. Apparently trying to view one product page after looking up a P/N in the search box qualifies as scraping?
Anyway, I guess I'm taking my business to Digi-Key.