You didn't say WHY you needed such items. That plays a major part in your method.
This is for unraveling.
1. DC Hammer, iron ingots, crafting armor. Look for Mage Armor or Night Sight items with resists that only total up to 21 + your Arms Lore Bonus. Alternatively, Spined Runic Kit, but if you're making leather, you'll only find for Night Sight.
2. DC Hammer, iron ingots, crafting weapons. Use a crafter that is under 95 skill, making items that 70% chance to make (10% exceptional base) - then equip the best blacksmith talisman you have with no bonus to exceptional. Properties that are 100% intensity are SC (FC -1), Faster Casting 1, Use Best Weapon Skill, and any slayer type.
In both these cases, you'll often end up with half your stuff being 2 properties; all 2-3 properties if making weapons and they come out exceptional.
3. From loot - any low to mid range spawn will be good - just look for the properties above (Mage Weapon on armor pieces that have only base resists). FC 1 and Night Sight are also common on 1-property jewels.
Now, if you intend to Imbue these items, the FC 1 Jewels are your most reliable (but still rare).
Weapons, you'll either have to settle for having DI as one of your properties (which you can lower to down to something like 2%, or 4% intensity), or find yourself limited to only 450 maximum intensity.
Armor is probably the hardest of all, as there's no way of telling what's REALLY 100% intensity in one resist property, or multiple intensities in 2-3 properties. If you luck out and get other 100% properties (the stat increases, HP Regen 2, Mana Regen 2, Stam regen 3, LMC 8, LRC 20 or RPD 15), those are a bit more obvious, but also more rare, and some are more desirable than others.
In all, for making armor, you're best off using a DC or Spined runic, and look for pieces that have base+6+lore resists, and 100% in a desired non-armor property - OR - look for pieces with one resist 18-22 (with or without additional non-resist properties; if with, it needs to be one you want), and imbuing around it - making sure with the imbuing gump that there isn't a pesky minimum resist runic property lurking on the item where you don't want it. Material depends on if you want to risk enhancing failure, in order to maximize resists (a non-issue if you buy the thing from gamecodes).