the dollar tree is a GREAT place for lots of stuff.
my everyday purchases are:
DOG TOYS, AND SOMETIMES EVEN DOG SHIRTS (i have two small dogs that shake all night, so they wear shirts and usually i pay between 8-15$ each for these so its a great find)
Also, my biggest purchase is cleaning supplies, bleach, windex (its the generic brand but oh well!) sponges, they have stovetop cleaner in the big bottle.
My other favorite things to buy are paper and plastic cups (but sometimes you can get a better sale at walgreens with a sale so keep a look out) Many times they sell ziploc brands and hefty brands for baggies and they sell SUN laundry detergent and even CUDDLE laundry dryer sheets.
I also buy things like plastic table cloths for parties, balloons, etc etc. Honestly, this is a place that i frequent about once a week because it is close, i would go there and stock up about once a month if it wasnt so close.
Another thing i noticed my dollar tree just started carrying were tortillas and bread (the one with the owl, i forget the name, its a name brand though) and they carry both whole wheat and white.