Id assume there are some out there that can beat that price! I also am having touble with items that need to be contracted such as BPO/BPC. Hard to value.
Why don’t you set yourself up with a trading alt who sells things for you near a trade hub. The character could even be an Alpha that you max out your social skills on. You could put them in a player hub in or near the trade hub (Dodixie or Jita for example) and then have the alt place the market orders for you and sell your loot and try to get the best prices for them. You might not get immediate returns but in the long term you’ll make better ones trading that way. That’s likely how the Buyback programs the big boy corps use operate. You’ll pay less in broker fees and taxes.
For BPCs those can be sold via contract. Look up what people are selling them for in local trade hubs. BPOs can be sold either directly at trade hubs or if you research them fully you can also sell them via contract.