You really have to trap your own data, if you want to be confident that you have a real handle on (recent) historical pricing. Keep a spread sheet of any items you bid on or watch and what they sell for. In the early days, you either have to mostly watch or plunge in and risk some amount of "overpaying" and/or "coming up short". Assume anything listed BIN/BO is listed at 2-3 times what the seller thinks it is worth. In auctions, assume that the high bid 24 hours before closing is 2/3 what the "market" thinks it is worth.
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