eBay $6 DDS Function Generator 1Hz

http://www.ebay.com/sch/i.html?_nkw=DDS+Frequency+Signal+Generator+Module+Sine+Wave+Square+Triangle+Sawtooth+ECG&_sacat=0
sine, square, triangle, noise, ramps, & EKG functions. 1, 2, 4, & 8 MHz TTL. Can not drive 1000 Ω load. This was measured with a 22kΩ load.