See:
http://www.latimes.com/business/la-fi-peso15jul15,1,1468215.story?coll=la-headlines-businessObligatory quote:
MEXICO CITY — Spurred by a stable economy and high interest rates, Mexico's peso is near a two-year high against the dollar, meaning that Californians headed south of the border for summer vacations should pack more cash along with sunscreen.
The currency ended trading Thursday at 10.66 to the greenback, a 4.6% increase on the year, putting it among the world's strongest currencies against the dollar in 2005. At the peso's low point, in May 2004, it took 11.67 pesos to buy a dollar.
...
The currency's rise has been a boon for Mexican consumers, for whom U.S. goods have become cheaper, fueling a shopping spree along some parts of the southern U.S. border. Retail sales in McAllen, Texas, which is heavily dependent on visitors from the Mexican cities of Reynosa and Monterrey, are up 6% through April, compared with the first four months of 2004, according to the McAllen Chamber of Commerce.
"When you go to the mall, it's like Christmas every weekend. You can't find a parking space," said Steve Ahlenius, president of the business group.
So the USA is now a shopping bargain for Mexican tourists.