not in stock

The article of furniture was on page 19 of the past weeks flyer.  Upon going to numerous stores, noone had it in stock.  It had been advertised at 50% off.  Now it is in the coming weeks flyer at 30% off.  What is going on here.  It seems to me that this is sime sort of scam to get patrons in your store.  If I couldn't get a rain check at 50% off how can I get a rain check for 30% off.