Bill Hunting!

I will say star notes,,,even if I am from canada....

Look for WEB notes, too.

http://en.wikipedia.org/wiki/Web_notes

Research "fancy"SN's and look for all of them.
John1

It depends on how picky you want to be. There are dozens of "fancy" serial numbers to keep if that's what you're into, but there is almost nothing that will fetch above face plus a dollar or two. Personally, I'd keep:

-Star notes with serial numbers below 00010000
-Regular notes with serial numbers below 00001000
-Solids/repeaters/counters/radars (no partials or non-sequential repeaters/radars)
-Silver certificates
-Bills from the 70s or before
-Web notes (yeah right!)

Also, how many notes do you plan to look through at once? These old hands are a bit rusty, but back when I was a 40 hour a week cashier, I could count (and check) 100 $1 bills in literally just a couple minutes. I checked out a customer who "runs a vending business and only pays in $1 bills" about once every month or so, and quite frequently got to process 150-250 bills in a single run. A $200 order had an average of two star notes and one bill from the 90s or 80s. If you are hoping to find anything really cool, you'll need to search about $1000 at a time, and expect to get to $10,000 before you find anything that's actually worth more than face.

At my work, I handled an average of $2,000 in cash every shift, 3-5 shifts a week, for nearly 4 years. During that time, I found (in all denominations) one silver certificate, one crisp old star note, two bills with a serial number under 1,000, and about $1500 face in random star notes and old bills before I cashed in $1200 to go toward my new car.