Nudity. DC 18 wisdom check or the target is terrified for 1 hour. Alternatively... like the Medusa... a character can cover their eyes to avoid the effect.
Alchemical Silver Kunai (22 gp) and a Cold Iron Dagger (4 gp). Covers B, S, and P and both cheap material DRs. Both can be thrown and are simple weapons for proficiency and are light weapons to use in a grapple or with weapon finesse. When you use the Kunai as B it doesn't take the -1 damage from alchemical silver since it's an 'or'.
Kunai counts as a crowbar but weighs less and costs the same as a crowbar (before material costs anyway). Also counts as a piton if you need to set a rope.
You can also get around most Hardness low level with a Durable Adamantine Shuriken for only 62-ish gp each. Though you have to throw it and point to the book(Alchemy Manual) where it says other piercing thrown weapons can be made durable.