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@BlackBat - You probably already know this, but liquidity is evident when looking at the Open Interest and Volume data. NVDA. it is also evident in the bid/ask spread. In general you could look for a tight spread - say 0.1% or less of the strike price. So for NVDA, 250 * 0.1% = $0.25, which is pretty much where the spread is in your table. PLCE, on the other hand, has relatively sparse OI and sparser Volume. Further, tthe spreads are also way over the suggested percentage, between 0.6% and 0.9% of the strike. This article may help.