Cleric Magic Items

[Terrofex]

I'm an undead cleric/paladin, a good one (using a BoVD template, just to add another layer of insane dichotomy to the myriad usually-mutually-exclusive things my character has, irrelevant here), and I was wondering something:

Is it possible to get/make/have made a magic item which has the effect of a permanent or X/day castings of Bolster Undead? My character is pretty powerful and plenty hitty, but this campaign setting is highly-holy, and as such Clerics may become something of an issue for my character, so some defence against people who want to turn/rebuke/control me would be a nice thing to have.

Thanks
'Fex