I can confirm that there is some sort of an unannounced semi-clearance on 8x Memorex +R at Best Buy. The one closest to me sells 50-packs for $14.99, but 10-packs are still $12.99. They were surprised by the price of the 50-pack... apparently, it was not marked as $14.99 on the shelf. I haven't asked about 25-packs, but it's pretty clear that these prices are different between stores.
If you feel adventurous, try your local best Buy and, of course, report your findings here.