Dollar Tree
Well Dollar Tree actually is one of my favourite stores, lots of good things actually and also buy many OTC drugs.
For certain things they have a good deal for others you better buy them in larger packages, sometimes it's the case of detergents and home care.
Yes a lot of people doing charity and the food pantries of churches helping families in need shop Dollar for hygiene items and food, they directly buy cartons of stuff and yes as you say it doesn't break the bank to help, I mean if you donate a $12 case of 12 packs laundry detergent you help 12 families doing 3-4 loads of laundry, and the convenience relies on the small packages they sell.
You'll often find branded items like gain or others in small bottles but you also find cheap brands like La's totally awesome in bigger bottles and they are not that bad.
I liked the sun color Bleach powder additive (percarbonate+enzymes).
They also used to carry a chlorinated old school dishwasher powder that was just fine and I do have 2 cases of it to use yet. But I think it was very worth the deal.
But actually as others have said sometimes it is just more convenient to buy bigger boxes like when they used to sell Sun laundry detergent,out of one box of 1cup formula you got like 3 to 4 loads, 5 at best, while for example at Walmart Kroger etc you get a 40 scoops package for 4 to 5 dollars.
In terms of weight and cost what you got in bigger boxes was cheaper.
The new Fresh and clean powder carried now appears to be a good amount of powder, possibly getting like 8 to 10 loads out of it..
I am curious to try it out.