Templar's Might can be found on Ladder, Non-Ladder or SP. I have found it in SP several times. All items except Annihilus and Hellfire Torch can be acquired in SP.
The only thing that is exclusively Ladder is the Ladder-only Runewords, such as Grief, Spirit and Infinity. A forum accepted mod for enabling these Runewords in SP can be downloaded and used (Runeword Mod - or RWM for short). Look in the Single player forum stickies for more info.
Ubers/Diablo Clone are Bnet only as well (Ladder or Non-Ladder), though a mod exsits for them to spawn in SP. This mod is not forum approved though, and will exclude you from trading if you choose to use it.