This is why you pay with cash at multiple different hardware stores, or - and this is the most effective - simply make sure you're prepared from the start, acquiring each of these as you need them normally and regularly restocking the consumables, meaning you're always ready to hide a body.
I feel like paying with cash is getting suspicious these days. I have gone to several cities in the past few years where they have said cash is no longer accepted. I hated it, but sadly, I think that's going to be everywhere eventually.