User blog comment:Artemis Paradox/The Official Monster Hunter Wikia Help Blog/@comment-3253026-20110612182412/@comment-969093-20110612212111

Unless you're desperate I wouldn't trade any of those 2 items for Firestones. They're not really that hard to get, despite the trouble you're having at the moment acquiring them. If it is any consolation, I went through the same hell and I didn't give up either. Now I've got 100% all equipment (for a while already actually xD) in MHFU.

Keep trying and don't give up.

As for Deathprize, it's the Viper Bite path which I believe is a sub-branch of the iron sword series. You'd have to look that one up in one of our trees or on GameFAQs. My knowledge of weapon paths isn't what it used to be when I still actively played unite. :/ I could seriously tell you everything in those days.