Our Target (CA) has July 4th merchandise marked down to 90% off, but the signs still all read 50% off. I was able to find:

about 30 onesies .39 each
about 30 small flags .09 each
lots of paper plates and napkins .19 each
wreaths $1.49
girls shirts .40 ?
girls skirt .40 ?
boys blue and grey shorts .40?
boys shirts .40?

Most of the clothes don't even look like July 4th stuff. They can definitely be worn year round.