Personally I like teh barghest/chaos beast solution. Quick, not clean, but definately efficient. And I could see an assasin's guild having one of those around just for that purpose.
One thing people I think have overlooked, is that while true resurrection brings back the person, it doesn't say it brings back them to the caster or anything.
You could put the body in a sealed up cavern, with an antimagic field on it. The body may get raised, but it dies again from lack of air, and I don't think its going to want to be raised again. Even if you tried teleporting there, you'd need a decent description of the area to know where to look, and divination spells would take time the body wouldn't have.
One thing people I think have overlooked, is that while true resurrection brings back the person, it doesn't say it brings back them to the caster or anything.
You could put the body in a sealed up cavern, with an antimagic field on it. The body may get raised, but it dies again from lack of air, and I don't think its going to want to be raised again. Even if you tried teleporting there, you'd need a decent description of the area to know where to look, and divination spells would take time the body wouldn't have.