Newegg offers the Lenovo H515s AMD 1.4GHz Desktop PC (no monitor), model no. 57328086, for $199.99 with free shipping. That's the lowest total price we could find by $20, although in September we saw it for $2 less. It features an AMD E1-2500 1.4GHz dual-core processor, 4GB RAM, 500GB hard drive, DVD burner, 802.11n wireless, media card reader, USB 3.0, and Windows 8.1 64-bit.
If you haven't yet, use Newegg’s Android app and pay using Google Wallet to cut it further to $184.99, which is the best price we've seen. (This discount can only be used once per account.)