Meds from Mexico?

I have used up my annual Part D Medicare $2,400, thanks to the unfettered greed of Big Pharma and the Politicos, and am now on the hook for my LANTUS, GLUCOPHAGE, GLIPIZIDE and also the other drugs I take for Cholesterol and Low-Tension Glaucoma. Since I live just a $100 train ride away from the border, I am thinking about making a trip to buy my meds for the rest of the year from there.Does anyone have any experience of doing this, any tips, any caveats they would be willing to share ?