Good deals on Walmart. I have 3 15lb dumbbells, one for each hand. (The accidentally sent an extra one). Nothing wrong with them and knurling is fine.

Classic slingshot. Great for overloading, should be easily be able to lift 20-30lbs over your max even if not peaked.

Great to get in some board presses without a crü. Takes some practice to get the positioning right for when it touches your chest.

Good to have for strongman training, easy to fill to desired weights. Don’t overpay for one though.

No easy way to fill them and not be loose. So you’re going to end up with a floppy bag, and likely need to duct tape the end. Recommend to buy the modern style with a zipper and Velcro. However if you end up in a comp using this style, it’d be useful to have trained it since it’ll feel very different.