Low carb crunch/cereal alternatives cheap?

Hi! From Australia here, I was wondering if anyone has any crunchy/crackle low carb or even just slightly lower in carbs (doesn’t have to be fully no carb if can’t) alternatives for things like cereal, granola or crackers? Or Any recipes or products? I like putting crunchy things onto my yogurt in mornings but they aren’t low carb. I know there are nuts and seeds but they just don’t hit the same. I don’t mind trying out recipes either but they have to be affordable. Almond flour where I am is not the cheapest and most recipes require that and most of these low carb cereals online are so expensive for me…thank you!