Many of us on the board have the City Mini Double. MelissaSue found a great deal on them and we all jumped. I really like it. It's light and easier to turn than my single. Downside is attachments are extra.
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We found a Graco Duo Glider on Craigslist for $100 and got that. It's big and heavy, but does it's job. We haven't used it all that much yet so we didn't want to spend the money on a City Mini (or any other more expensive one) until we knew if it would be worth the money. So far, the Graco works fine for us.
Re: Double Stroller