Size 7 diapers?

Al

What do you do when your child is outgrowing size 6 diapers? We are not ready to potty train yet and I’d prefer to stay with diapers and not pull ups at the moment. My Walmart does sell a box of Parents Choice size 7 but it’s $17 and I would hate to buy it and have it not work for us. We currently use ALDI brand ( have been for a year and a half with no issues) and he’s peeing through the size 6 every 2 hours. Help!