Whats the best way to get power crystals on ironman?

[Looting_VII]

Ive been playing ironman for a long time im lvl 342 with around 22b nw but I basicly never use the beacon because of how annoying powering him up is as the fastest way I found for getting it was killing treasure hoarders on the upper mines which considering is needed to be done every 48 hours is very inconvenient especially since im missing 10% minion speed boost and 5 magic find.
is there any faster ways of getting starfall other than killing the treasure hoarders in the upper mines?

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