Yeah, best buy is terrible. I've noticed the same thing when browsing, where there are sometimes midrange cards with an OK price but low end stuff (which people are probably desperate for in case of a repair or system failure) is just a major ripoff.
Worse, I think they still had a radeon 9200 PCI for sale for like $50 last time I was there. Isn't that card like 10 years old now?
The last time I glanced at video cards at Best Buy they still had a 7300 GT.