Windows Live Mail Question

I use the Windows Live Mail message rules to pick out the text line

Quantity remaining: 0

in my ebay email messages to flag up when I'm out of stock in something.
Note it has to be 4 spaces between the colon and the 0 for it to work.

I'd like to be able to pick out: Quantity remaining: 1 and other low numbers too. But then I get hits for 10, 11, 123 etc which I don't want.

The search feature isn't much good for this either. If I do a search for:
quantity remaining:
I get hits

but
quantity remaining: 1
I get no hits even though I know for sure the text string is there.

Anyone have any suggestions? Happy to pay $20 by paypal for the best solution to this problem!