Spend this kind of Green on a Diaper Bag - You Better Have Some Left Over for Food
You can carry a diaper bag that costs you nothing. I have actually done this: take a brown paper grocery bag and line it with a kitchen garbage bag - throw in a few extra ziplocs and garbage liners for those wet nappies and you are all set: you have a diaper bag that is unique in all the world - and it cost you nothing.
You won't look very cool doing it, however.
If you don't want to look like a homeless person, or worse, like a harried mommy with some dribble milk-and-cheerio stained quilty thing (the cloth bags also tend to hold smells - you know - babies just bring with them wonderful and terrible smells) with a little bit of what is (hopefully) strained peas painting the side of it - you can do something different.
For a mere six hundred bucks (you read that right - $600 - six bills baby) you can have a sexy leather diaper bag that looks like something you might see on the Matrix being carried by Keanu Reeves' girlfriend. And now that I think of it you would look very sexy holding this bag, wearing a pair of dark shades and a calf-length leather coat. Whew.
Seriously, people pay big bucks for their kiddy-accessories. For that kind of money, I would like a part-time nanny to carry the thing around. What you really get is the chance to disguise your mommy-self as a movie star or rugged Lara Croft meets Katie Couric power business executive who likes exploring South American jungles in her spare time.
When you think of it that way - I'd spend six hundred on it.