This pertains to Nightmare NPC Shopping but also includes Hell NPC shopping either method works. If you are an LLD player shopping Nightmare for MLD items, please read on.
I'm looking for a magic Fools Cutlass with Zeal charges or a Fools Phase Blade with zeal charges you can find this just by walking between the vendor (read below for which ones) and the waypoint (or town exit), take wp to any area in the act ur in then back to town shop the vendor (also works with cow portal and uber portal) rinse and repeat.
I did this for a hour and saw like 5 fools cutlasses and 2 zeal cutlasses all i need is one with both of those (read below)
Nightmare Gheed seems to have the most Cutlass type weapons of any Vendor which is nice because you can get a town with the exit right next to him just walk out and walk back in.
also a high level character may be required also a fast char using vigor and/or enigma and other high frw gear makes it easier to shop
also works for rare swords but they must come with 2os already or 1os with at least 10 base IAS
Paying 100fg per unsocketed and 200fg per 2os
These are the vendors you can shop them from
Cutlass
Charsi (Nightmare), Gheed (Nightmare), Fara (Nightmare), Elzix (Nightmare)
Phase Blade
Drognan (Hell), Ormus (Hell), Jamella (Hell), Larzuk (Hell)