I used to punk the shit too....sucrets, robitussin, and delsym. Until one day, the store manager yanked me from an aisle as i had a delsym concealed in my pocket. He saw me throw the box so he grabbed me. That was a shitty day.....

Anyways.. nowadays if i want to trip DXM i go to the grocery pharmacy, and buy robitussin DM cough gels. They are relatively cheap... (5.60$) and a whole bottle gets you pretty damn stoned. If your having that much trouble buying it... mabye buy sucret lozenges. each contains 15mg of DXM, and most people dont know you can extract the raw powder from them.

Best Sucret Extraction method
http://www.dextroverse.org/txt/sucretextract1.txt

If all else fails, id try another store...