Hey smokey, if you search $100 in CWR halves and are skunked you are searching someone else's dumps. Don't worry, it happens.
Think about: who is depositing rolls of halves at the banks these days? They are hardly seen in daily life. The depositor is either bringing in rolls that someone had tucked away, in which case you will find silver (one exception is bicentennials, which some people saved), or the depositor is a CRHer, in which case you will find zip.
Aside from a roll or two of bicentennials, I have only found four true CWRs of halves, an each roll gave up silver. All the others were dumps in MWRs that had one end opened and refilled (I hate those - was offered a box of those today and turned them down).
You will find lots of loose halves and MWRs. You will not find many true CWRs. But when you do find them, chances are you will score.