During the week I shopped at Aldi.
I thought I would get the biodegradable bags, I only needed a few and I believe the ones which include cornstarch in the ingredients will degrade fine in the soil (I use my bags for rubbish bags).
I grabbed several of the biodegradable cornstarch bags and put them on the conveyor belt. Now, it's probably a good idea to use these bags, they're much more environmentally friendly. Unlike the mor solid plastic ones and the indestructibe petrochemical enviro shopping bags which are useless for anything else when they wear out (the handles wear out quickly).
The checkout woman said to me "You do know that those are the most expensive bags?" she said, picking up the cornflour blend ones. I didn't as it turns out. "Why, how much are they?" I asked. "Eighty five cents, and those are only fifteen cents." WOOT? Ok. Put back the biodegradable bags and grab the plastic ones. The plastic which takes forever to degrade, unline the other ordingary bags which degrade in the sun.