Sony A99 has a Sony/Minolta Alpha lens mount and currently there are 143 native lenses available for this mount.
A99 also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on A99.
Since Sony A99 has a Full frame sensor, it has a focal length multiplier of 1x so lenses will provide their original focal length on A99.
You may also also be interested in these:
Sony A99 Lenses with Image Stabilization
Sony A99 Lenses with Weather Sealings