Swaging dies and tools show up at estate sales, on occasion. That's about the only chance you've got at obtaining the stuff at a discount. However... it's likely to be for some oddball bullet, in an odd diameter. (Like a 250 gr semi-elliptical 'spitzer' with body diameter tapering from .329" to .325".)
The general 'used' market for swaging tools sees prices running only about 10-25% below original cost (maybe 40% for low quality items from manufacturers that are no longer in business).
"Such is the strange way that man works -- first he virtually destroys a species and then does everything in his power to restore it."