I used 1dollarscan to scan my High School yearbooks and camp yearbooks. I cautiously recommend them. Be very careful about the options you choose. The first time I got my pdfs back, the scans did not include images of the covers – that was a separate (higher) price tier. Luckily (and smartly) they keep the scanned materials for (if I remember correctly) a week, so if you want a rescan or to bump up to a higher level of service/price you can do that. The website works, but is a bit out of keeping with my (perhaps spoiled) sense of online commerce design — that plus the anxiety of necessarily losing the originals made me quite thorough and skittish using the clunky site. But, if you would love to shed the physical bulk of items you only occasionally have use of, it worked for me.

I originally found it through an article in The Economist: http://www.economist.com/blogs/babbage/2011/10/media-digitisation