Ok so I priced my Valkyrie brass @ $150 for 300 rounds. I know it is once fired because we shot it.
Am I too high?

Normally I would expect to pay around half of what new would cost….unless it was Federal which is usually only good for a couple reloads.
This might vary if it’s impossibly hard to find.

Used brass for a higher price than brand new Starline brass? (and they don't charge tax or shipping - the price they list is exactly what you pay to have it delivered to your house). I'd say you're priced a little high.

224 Valkyrie available right now on their website for:

250 for $116.00 ($0.46/each)
500 for $212.50 (0.43/each)
1000 for $402.00 ($0.40/each)

I agree with DStroud ... I would expect to see used brass around half the cost of new brass... so $0.20 - $0.25/piece in this case.

I usually put fired brass at about 1/3 the cost of new. You don't know how many reloads and how hot the load used in the brass.

Thanks guys