Formula Needed For Calculating Profit On Sales

In my spreadsheet, I have data for each sale in each row. Column C is the buy price, and column D is the sell price. I need column C to be subtracted from column D to get the profit into column E so that I can AutoSUM any cells in column E for total profit over any time period. The problem I'm having is that in columns C and D, I have either a dollar sign in front, or the letter m following without a space (ie $45.00 or 150m). Many cells in column C also contain another word following the buy price, and many cells in column D have a date following the sell price (ie $32.00 12/11 or 42m buyout).

Examples of how my spreadsheet looks:
A1: 12/13/12 B1: Item #1 C1: 100m D1: 152m
A2: 12/14/12 B2: Item #2 C2: $20.00 D2: $35.00
A3: 12/15/12 B3: Item #3 C3: 90m bid D3: 120m 12/16

So looking at my example above, I would need cell E1 to automatically show "52m", cell E2 "$15.00", and cell E3 "30m"

How I can get a formula for all of column E that will give me my profit for both $ and "m" for each item (row). I have tried the SUM function but just keep getting the #VALUE! error, it does not ignore the text like many people say it should.