The DP870 impresses most users posting Coby digital frame reviews at Amazon; they say the picture and sound quality are both superb. However, some users note that setup can be a bit tricky and it's important to read the instruction manual before you begin. Editors at TopTenReviews like the excellent audio and display quality, according to the site's Coby digital frame review. What they don't like is the non-existent internal memory.
The Coby DP870 (starting at $60, Amazon) is an 8-inch frame with 800x600 resolution. Information about aspect ratio isn't offered online, but users posting Coby digital frame reviews don't complain about picture distortion. This cheap digital picture frame also supports multiple image, music, and video files. Although it doesn't have any internal memory, it does boast a USB port and several memory-card slots to support plenty of external memory. This cheap digital photo frame is backed by a somewhat short 90-day warranty. It comes with a remote control; a slide show feature; and clock, timer, and calendar functions.
If you can live without internal memory -- which would mean using memory cards or sticks to display your photos -- this is a good, cheap digital frame. Users report beautiful screen quality and clear audio. Provided you read the instructions, it should be easy to set up and use.