Go to ebay, look for the models and then tick in the options at the left the "Last Sold".
You can see here the prices of those miniatures. I recommend to put them in "Buy now!" for that price and just wayt. If you have some miniatures that are just... you know. A little crappy and don't expect much, just put them in auction. Personally, I always put them to buy for a fixed price and wait.
You take long, but you can have bigger benefices and more reliable.
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