Hey Cuddly Ninja,
I feel silly saying this about a 450mW green laser, but you might want to lower your price of $400 if you want a better shot at selling it.
You're new here, and you don't have an LPM to test the power of this laser. That's going to be a BIG detriment to selling it right off the bat. It makes this laser an "unknown".
At $400 US thats a lot for a laser that is potentially 450mW, but untested, and sold by someone new to the boards. For comparison, a "450mW power certified" LPM'd laser from dinodirect that looks similar can be had for ~$250:
Firedragon-
To be clear, DinoDirect is not the mark of "high reputation" around here, but they do (supposedly) test these "power certified" lasers on an LPM, and they do offer refunds/exchanges if not up to power specs. At the very least, they're less of an unknown than someone new on these boards, without an LPM.
Or at least - that's where my head would be going if I was thinking about purchasing another high powered green. Just my $0.02