Dollar stores are weird. You can get some bargains, but other items are offered in strange little sizes to even out the price point: e.g. a box of cake mix that bakes exactly six cupcakes.
Know what you mean.
I stick to Dollar General. More of them than Post Offices around here, almost.
Name brand stuff at prices that sometimes beat Wally Whirled.
And no ways near the hassle. I pass 3 of them on a 35 mile commute to a jobsite. In and out in 5 minutes.