Outpost.com has a great deal on Polk Audio R15s:

One pair goes for only $49.98. Ground shipping to my office starts at $18.72/pair; additional pairs get a price break on the shipping. By comparison, J&R (who has bad-ass customer service) has the same speakers for $89.88, which is also a good price, but obviously not as good as Outpost’s.

Note: Stay away from microuse_stores. They offer the speakers for $38.95, but they’re just an Amazon affiliate. If you go to the Amazon Marketplace, a sketchy company is selling the R15s for $38.95 per speaker, saying that they must be ordered in pairs. But none of this is obvious if you go through the microuse shill link, which takes you directly to the Amazon cart.

Oh, and J&R rocks because they offered me an additional $10 off per pair for speakers that had already shipped!