You can get 24(100) times better than 1us (24Msps/100Msps) for 5$(26$) with free shipping, I have both and they work well: https://www.aliexpress.com/item/1Pcs-New-Arrival-USB-Logic-Analyze-24M-8CH/32499647340.html
Hermann.
P.S: I did create 41.67MHz with Pi Zero PWM (verified with above 100Msps logic analyzer) and learned from others that even higher frequencies can be generated: www.raspberrypi.org/forums/viewtopic.php?t=157907&p=1027501