Dell Small Business offers its Dell OptiPlex 3060 Intel Coffee Lake Core i3 3.1GHz Micro Desktop PC for $589. Coupon code "DBGMDT509" cuts that to $509. With free shipping, that's $51 under the lowest price we could find for a similar PC elsewhere. Features include:

Intel Core i3-8100T 3.1GHz Coffee Lake quad-core processor

8GB RAM & 500GB hard drive

WiFi 5 & Bluetooth 4.1

Windows 10 Pro 64-bit