We just had a store-wide sale that ended less than a month ago. The one before that was during last year's Rising - I remember that because I was expecting to wait the year for it to come around again.
Inbetween I'm sure we've had smaller sales, though they weren't what I was looking for personally. But even if there wasn't anything else within your definition, we have certainly had at least two sales in your time here so either you're not watching that closely or you're exaggerating.