good speakers, but..
The primus 150's are a good buy, even at normal prices. The only issues are size and weight. The speaker is very deep, making for a big box and correspondingly low WAF.. It is, after all, a true bookshelf, rather than a surround. The package also weighs over 8 pounds, so don't expect to be using the $ 10 Walmart mounts. Even with a good mount rated at 11 pounds, you better be drilling into wood, not sheetrock, or you're going to be cleaning up a bunch of plaster and a broken speaker in the morning...
Don;t get me wrong, the sound is great and it's a killer value. Just be prepared to hang a solid chunk of speaker and maybe have to hide it.
BTW, Ultimate Electronics and Crutchfield are honoring the sale as well. Crutchfield will even give you the speakers if you spend $ 398 on their clear-out alphas (including the excellent $250 Alpha 37C center, originally a $ 399 retail and also a solid chunk at 33 pounds) or their scratch & dents.