Acting on a tip-off, police found a pickup truck parked on the first floor of a shophouse in Ban Payang village in Tambon Wiengphankham a little past midnight.
Police found the drug both on the back of the pickup and in the house.
Kittipong Phanchomphu, 24,and Supachai Rungruang, 31, both from Lampang province’s Muang district, were arrested at the scene.
The two told police that they were paid to take the drug from Mae Sai to Phare for another mule to pick up.