The littler cages:
• Kaytee CritterTrail 1: $22.39 at Amazon
16Lx10Wx11”H/40.6x25.4x27.9cm
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Kaytee CritterTrail 2-Level Habitat: $30.95
16x10.5x16”/40.6x26.6x40.6cm
Super Pet CritterTrail Extreme Challenge Habitat: $ 39.99 & Free Shipping at Amazon
20x11.5x18”/50.8/29x2x45.7cm
Super Pet CritterTrail Mini One Habitat: $ 15.37
12-1/2x8x7-1/2”/31.7x20.3x19cm
Super Pet CritterTrail Mini Two Habitat: $ 17.71
13x8x 9.25"/33x20.3x23.5cm