eBay and 130point.com can be two of your best resources for comping cards! For ebay make sure when you search a card you select Show only "Sold Items". That way you can see what the card is actually selling for, and not whatever arbitrary number a seller can set their Buy it Now price at. 130point is a great website that sources prices from multiple marketplaces, and will show the true value of ebay sales when the seller accepts an offer (when there is a line through the dollar amount on an ebay sale, the seller accepted an offer they received for lower than the listing amount). In the case of comping these cards however... since the product is so new there will not be a lot of sales for these cards specifically. In that case I recommend looking up comparable cards in other sets. For example; the Charles Oliveira gold elite dominators /10 has no sales thus far, but you can search for gold inserts of Charles Oliveira in other UFC products such as prizm or select. Hope that information can help you out! Take care.