I believe A3391 by Allegro should work same as mine which are about 275 Gauss for the Bop:
https://www.amazon.com/EPLZON-Effect-Magnetic-Detector-Arduino/dp/B09PG3PGH6/
Here is the datasheet: https://www.mpja.com/download/a3144eul.pdf
Just make sure you are getting a switch, not an analog sensor, by reading the datasheet for whatever you use.