I have the Bushnell Banner Dusk & Dawn 4-12x40mm sitting on a Tech Force 99 .22 "Magnum," (again).  I had taken it off and slapped it on a Ruger 10/22 to verify it's accuracy, but decided to go back to using it on an Air Rifle.  Straight Shooters has a list of airgun-rated scopes on it (admittedly pricey), might also try The Optic Zone and see what they have.  As you know, they should be "airgun-rated" for the springers.  Try what I refer to as the "online Marts" - CTD, Natchez, Midway, Grafs, Cabelas, etc.  Compesseco has the "Tech Force" line of scopes too.  Try PyramidAir too.