BUY or DIY: Hula Hoop Tent.

For other DIY CanopyTents, see Below:

For a cheaper tent use sheets for fabric as seen in the  DIY Hula Hoop Tents from The Craft Nest here.

You can also use a large embroidery hoop to make a canopy tent like the one at Sew Liberated here. She used silk for the fabric but you can also use parachute-like fabric as a cheaper alternative.