Hi all, long time user, first time poster.
Title says it all, to receive the discount, do the following:
1 - Have a smartphone
2 - Download foursquare (an application used to 'check-in' to places, similar to facebook check in - facebook stole the idea from foursquare mind you)
3 - Check in at any 1st Choice, show it to the person at the check out counter and receive 50% off your choice of any 6 or 4 pack of beer.
Conditions are 1 4-6 pack per person, per day.
The only link I can find is on the foursquare website, but I can confirm I went in yesterday and got the deal myself.
Also via twitter: http://twitter.com/#!/1stChoiceLiquor/status/76448146741411840