Speaker
Thin: If you want to get some sound out of your project but have a tight space budget, this is a good way to do it. This 0.25W, 8Ohm speaker is only 40mm in diameter and just over 4mm thick, the same kind you might find in one of those "talking greeting cards". (https://www.adafruit.com/product/1891)
Thin metal: https://www.adafruit.com/product/1890
PCB mount: https://www.adafruit.com/product/1898
Mono enclosed: https://www.adafruit.com/product/3351
2in 4ohm 3W: https://www.amazon.ca/-/fr/Gikfun-EK1725-haut-parleurs-st%C3%A9r%C3%A9o-Arduino/dp/B01N74TGFM/ref=sr_1_15?__mk_fr_CA=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=2in+speaker+4ohm+3W&qid=1630424711&sr=8-15
Stereo 60mm: https://www.amazon.ca/-/fr/haut-parleur-st%C3%A9r%C3%A9o-portable-lecteur-t%C3%A9l%C3%A9phone/dp/B07MTYKNKH/ref=pd_sim_1/146-0533020-5398463?pd_rd_w=CGmJm&pf_rd_p=a2bd0889-95ca-42f8-b18e-dd0acf562bee&pf_rd_r=BTNENWR50BQWHYAMH0N3&pd_rd_r=c3ce9f39-b5ac-4d78-a226-9ef39e64a01c&pd_rd_wg=t7GXy&pd_rd_i=B07MTYKNKH&psc=1