Sprint has been advertising their BlackBerry Curve 8330 in a lot of American newspapers on Sunday. It's showing the Curve "coming soon" for $179.99 with contract after rebates. One interesting bit about this ad is that it shows two colors available (Titanium and Red). So most likely we will see Sprint's Curve available this week.
[Source]
[...] in their online store for $299 after online discount and mail-in rebate. Sprint ads for it are appearing in American newspapers, offering a red or titanium Curve with a price of $179 after rebate, and [...]