Try buying actual Velcro not dollar store garbage.

I’d probably try a craft store for something like that

Amazon, Home Depot, Lowes, Walmart, Target, Harbor Freight are your online/big box/retail chain options. Otherwise, check our your local hardware store or craft store, as others have mentioned.

Hobby/craft or fabric stores usually have more heavy duty velcro. Also maybe a home hardware/home depot style store.

Isn’t the whole point of Velcro that you can rip it in half?