Tim - You can get them online and large hard copies at Amazon, West Marine, Boaters World and most marine supply stores. You can also purchase large-scale individual charts or a complete book, spiral bound. Jim
I second what Jerry says...I recommend you GO there and let them bring up the actual chart on their big screen - it will show you what detail is available before you buy. They actually PRINT the map while you wait - more than adequate detail of specific rivers and their creeks, islands, obstructions, bridges, DEPTHS, etc.
Much more helpful than the Chesapeake Boaters Chart Book.
The charts are approx 3'x4' - not waterproof
Each charts costs about $25-$30 - I think they are VERY much worth the price and have help me improve my catches over the years.
I have to give credit to the blue crab archives. It is basically Google Earth with NOAA charts overlaid. You can zoom & pan which allows you to print out exactly the sections of chart you want. I prefer it to the NOAA chart viewer which often cuts charts at the sections I need to see on one sheet.
TimBass, what rivers are you looking for? I have a Maptech, Baltimore to Annapolis waterproof chart that I don't use anymore. Maptech #43 Edition 1 , It's not listed on their website, I got it at West Marine prolly around 6 years ago.
Got a couple small tears on the folds and it's a little dirty but still very readable. Your's for the taking if it's what you're looking for.