Originally Posted by NWA_via_MSP
Don't go with UPS. I did and it was a FORTUNE!!!
I used UPS Ground a few years ago from upstate NY to NYC, and it was ~$20 for a box of books & papers or a large box of clothes. I have no idea whether it's similar prices for across the country.
Also check craigslist - people are often driving cars/vans and might be willing to transport boxes.