I'm just wondering ways to get my scion xb's ride to be a little smoother, especially at freeway speeds. What ways would be the best to achieve this, and around how much will it cost?

You could play around with your tire pressure or do some research and find out what kind of tires provide the most comfortable ride. Don't travel with a lot of cargo in your vehicle if you are. And the cheapest way is to only drive on smooth roads :D

more tire= smoother ride.....i think.

TRD springs. $145, shipped on ebay.

Or take out your shocks, remove the bump stop, cut the top portion off (about an inch), and re-assemble.