Things that I've purchased recently that have made me happy because they were less than $4.00 a piece at various stores.

Love at first sight: Good Will for $1.00

Happiness in a Jar: Good Will $4.00

Pretty Piece of White: Good Will $1.00

True Pillow Love: Pier One Imports: $2.49

Perfect Couch Colors: Pier One Imports: $2.49 x two(one for each couch)

This one wasn't under $4.00, but it was a STEAL regardless!
Perfect lazy day cushion and/or Belle bed (she hasn't exactly taken it over yet...she's UNSURE about it)
Papasan Chair Cusion: Pier One Imports: $12.98