I've had pretty good luck buying orchids at Lowe's myself. I rarely shop at HD because they don't have a clearance rack where they discount their plants, and Lowe's does. I am a terrible bargain hound, so I love checking the "death rack"
They always put their orchids on the clearance rack when they are finished blooming, and I have scored Phals for $3 with nothing wrong with them but finished flowers. But as Lindsey said, the 'bag babies' are the most fun to shop for. Usually around $12 and they've had some really nice varieties, always have tags with the actual name of the orchid, as well.
This one I posted on the blooms thread this morning was a bag baby from Lowe's a couple of years ago.