We've been on the lookout for one of these since we ditched the car back in September. Not something that's been completely essential, we've certainly gotten by pretty well with our handy fabric bags. But we have jealously watched many many people walking around our neighborhood with these in tow. A few weeks back we checked out the Container Store, where they are avaliable, but rather high priced (which seems to always be the case there.) Finally it was our neighborhood ACE Hardware where we found success. Also purchased: a mop & bucket.
And, oh, this was on the way back from Printer's Row, home of Loopy Yarns. I did make a modest yarn purchase there, nothing very fancy. The "jumbo" shopping cart is the news of the day.