Amazon has the Bulletproof Brain Octane C8 MCT Oil (3 Oz) for $7.45 - 10% off with Subscribe & Save (can cancel anytime) = $6.71 with free shipping on $35+ or with Prime (extra 15% off for 5+ subscribe and save orders).

Per seller, this oil provides rapid mental and physical energy, supports cognitive function and helps control occasional cravings.