I just got Raz0r a couple of days ago. Henry is really easy to find. He's just south of Highlands - Overlook. If you jump off the cliff near the wind catcher sock thingy you should practically land on him. It take like 5 seconds from the fast travel so he's really easy and quick to farm.
I started farming him two days ago and after about 50 attempts I got Raz0r for Zer0(my main). A few attempts later I got a lvl 16 The Cradle. I won't ever use it but it's cool for the collection. Then about 5 tries later I got Dapper Gent for Axton(my friends main).
But if you want to trade for Raz0r do you have M0t0cross Marauder? --- "Bingo!!!" - Bayman, Dead Or Alive series XBOX Live Gamertag: Vlad Impaler7