On the cheaper side, there are some very good 790X chipset AM3 boards still around.
Like this ASUS M4A79XTD EVO
for $114 ($94 w/ MiR). It may not have SATA and USB 3.0, but it's still a very capable board.
There are also some 790X boards that have SATA and USB 3.0 support. But, their prices tend to be within $10 or so of 890GX boards. Here are two from Gigabyte:GA-890XA-UD3
for $120 ($105 w/ MiR)GA-MA790XTA-UD4
for $130 ($115 w/ MiR)