Actually, the only good prices on anime I've seen from best Buy recently have been price mistakes or price drops. They had a decent sale, 20% off all anime, a while back, but other than that, their anime prices have consistently gone up [based on what I've seen].
I bought Excel Saga 1 from Suncoast [!] not too long after release as a blind buy for 17.99, vol 2, from BB for 19.99, and now BB wants 24.99 for each single disk. The Imperfect Collection they now want 67.99 for, I bought it for 57.99 [tag] - 20% during that sale.
Good prices on anime and Best Buy, are two phrases that don't go together very well anymore, unless they're combined with 'price mistake' or 'clearance' [like the ADV thing, I got Farscape S1 for 25.]