How do you most effectively deal with those blasted stone golems? I've quite the shortage of +2 weapons... and I can cast "lower resistance" only so quickly...

TIA

You need +2 weapons or better im afraid, and their magical resistance makes them dangerous to an ill equipped party. +2 Arrows or bullets are the cheapest option.

Casting haste is another useful move, however, these golems have a lot of HP.

SPOILER
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Stone Golem:
AC: 5
Hit Dice: 14

Wait until you find/buy some, maybe?! There is also the "Enchanted Weapon" spell and I believe that "Melf's Minute Meteors" will also effect them.

Spiritual hammer also works..

I suppose I could get pelted with boos by some purists for this, but...

how about traps?