Amazon.com has Arkham Horror: The Card Game for $17.87. Shipping is free with Prime or on orders $25+.
Note, in stock soon from Amazon.
Walmart.com also has Arkham Horror: The Card Game for $17.87. Shipping is free with Walmart+ ( free 15-Day Trial ) or on orders $35+.
I see there is a recent @ $19.51 but figured the price drop was worth a new post.