If I recall right, about $500 for the electronics and $150-ish for the picture frame (it's a nice one with anti-reflective UV filter glass, because at the time I wasn't sure where I'd hang it and e-ink can be susceptible to UV light).
So far my guests are mostly puzzled by "Why'd you frame that?" until I tell them it will in fact change and isn't my most prized selection of news articles :-)
Also the album link in the other comment.