sale product - limited stock available

This week shop there is a special on the 6 pack mama's pies. Everytime there is this special, the only variety pies is the cornish and chicken and mushroom pies. I spoke to a manager at the store and he confirmed that when this special is on the supplier only send this two types of pies. How is this possible that the advertise and they can supply... Totally unhappy with this!!!<br> <br>