[andrelayer]

Unpakt.com is pretty good for this, though they index only professional moving companies. You enter the general stuff you're going to move and they compare prices across a bunch of providers.

[ghshephard]

My average price for moving is around $100 - though I've paid as much as $150, and the best experience ever was for $120.

The cheapest price on unpakt is $517 for my type of move. They are clearly looking at a different target market.