My kids love yardsaling... well, my youngest is only 10 mon. so I guess he doesn't have an opinion yet

. But he doesn't mind it. I definately can't go power-yard-saling with the kids b/c of the time to get in & out of car = time to change dipes, BF, etc. My older son loves YSing, but I don't really love him to go with me b/c he always just wants to buy junky toys. He started having to bring his own coin pouch to pay for his stuff. Also, if he's with me I can't buy him presents (or buy surprises for DH - he always gives it away!). But since DH is gone all week, he doesn't mind hanging out with DS1 while I yardsale Sat. mornings.
Another thought about that is: 2 yrs. ago, when we lived closer to town, 3 other moms & I started a child-care coop on Sat. mornings. I was the only one using it to go yardsaling, but it worked out well for everyone. I only had to sacrifice 1 sat. morning a month to stay at home.
guerrillamama~ You should definatly check out the Complete TWG. the author lives rural, but she used to live in NYC (i think that was the city) and has great tips on how to maximize storage space, and live frugally in a city
For used books, check out
http://www.addall.com
It has a database of every single used book website you can imagine. It just searches all of them and finds the best rates!
I am a WAHM. I do ebay and shipping for Suzanne Arms' local non-profit. Guerrillamama~ I'm sort of in the opposite situation as you, b/c I live extremely rural. But a friend who lives up the mountain from me has had major car problems, and for several months, she would just ride into town with us, and she could buy all her bulk groceries, go yardsaling, to the thrift, etc. Do you know anyone who is also into bulk buying and has a car that could help you out?