If you're looking for a stable, comfortable and easily collapsable (for transport) throne for a great price, the TAMA HT130 is pretty unbeatable.

Features:

• 13" diameter, 90mm (3-1/2")
• Thick round seat
• Double-braced legs
• Adjustable height range: 445mm - 620mm (17-1/2" - 24-7/16")