You can use .SubString and other string functions to parse the number.
VB Code:
  1. Dim str As String = "my cost = 30530$"

  2. Dim iNum As Integer = str.IndexOf("=", 0)

  3. str = str.Substring(iNum + 1)

  4. str = str.Substring(0, str.Length - 1)

  5. MessageBox.Show(str) '30530