I just got back from Petco, picking up mouse supplies for Marshmallow. The two-level pink cage I got her rang up for $0.00. I didn't say anything and neither did the cashier, so I got it for free! Marshmallow favorite thing in the habitat so far is the wheel, she has been on it for most of the short time she's been in the there. I can't get over how adorable Marshmallow is. I hope she's happy in her new home.