Needs more planning. Also, how about not purchasing anything on that day?
Here's a link to purchase Mexican flags.
Buy them and burn them in protest during a street demonstration.
Mexico state stick flag 12 x 18 inch, mounted on a 24 inch wooden stick. Flag is made from polyester and printed in bright colors to make an attractive flag. Each flag is individually sewn around the edges.
Quantity Discounts!
1 + $2.20 ea.
2 - 5 $2.00 ea.
6 + $1.80 ea.
http://www.united-states-flag.com/wmx1218hf.html