I've had very good luck buying used target barrels. .224, 6mm, 6.5mm, and .30 cal all come up for sale now and then. If you don't need a full 30", many long range barrels can be cut back at the chamber end and they'll shoot very well at less than half the cost of the new custom...otherwise I just buy new top-grade barrels. Brux barrels is a newer company making cut-rifled barrels, and I believe their prices are closer to $240 than the $300 for most of the other big name cut barrels.
Button barrels are more reasonable, Shilen's are in the $200 range last I looked.