Hammer Hafts(and the other upgrade whose name escapes my memory at this point)

Anyone know where you get these or what monsters drop them the most? I've been playing heavily the last few weeks in content of level 13 or higher without any success at all in finding any at all. It would indeed be nice to have the FP to get them for any PvP chars, but I'd like to have some for my Hammer W/Mo in the actual RP game.

Melee mobs.
If I was you, and I wanted hammer upgrades, I'd probably be killing griffins, giants, ettins and grawl. Or more likely I'd buy them, as upgrades are generally quite cheap.

Ok cool on what drops them. Where does one buy upgrades. I've only ever seen people offering. I've never seen an NPC that sells them. My current hammer is customized, and I have a rune I think that increases my hammer mastery, but I don't know where NPC's that sell upgrades would be unless you're speaking of faction unlocks.

No, no npc sells them. Do what everyone else does, and go to Lions Arch, district 1, and shout "WTB HAMMER UPGRADES!" in the All channel. Sorry, I mean Trade channel.
Expect to pay from 200 gold to <insert fantasy sum the seller will never get here> depending on how rare/godly/trendy the upgrade is.

If you want unlocks, buy un-identified purple & gold hammers. You can always salvage them for upgrades if there's anything on them worth having.

LOL, so true. Anyways, there's a price guide in the "Etc" forum here (Under Ventari's Sell) that tells you what the mods roughly go for. I suggest printing it out and highlighting what it is that you want so you know if you're getting a deal or getting ripped off.