When you come to the main set of traffic ligths just before the town with a big PT petrol sation on the rigth.
GPS number
20.419188 99.884012
You carry on pass Tesco on the right
And I think it's just passed that on the rigth
Big shop
Forgot the name sorry.
Also you can check out the market shop.
Go to the border take the left hand slip road and turn left.
Just before the slip road goes under the border bridge.
As you turn left it's about 7 market shops down on the right.
Between the 2 you should be abel to find all the stuff you need.
IMO the first shop is,the best.