The last time I checked, Sams has McCormick vanilla, 8 ounce bottle, for just under $20. I haven't been to Costco lately, their prices are usually similar though often slightly higher than Sams.
Vanilla prices are slowly coming down but food price experts don't think they'll ever get back to the levels we saw 3-4 years ago. I've seen several chefs and food writers talking about what items need real vanilla and what ones are OK with artificial vanilla, which remains fairly cheap.