One can purchase a Gibson SG bass guitar from music stores such as Guitar Center. A Gibson SG bass guitar can also be purchased online via websites run by companies such as EBay, Amazon, and the Gibson website itself.
The Gibson SG was Gibson's first solid body guitar and was infact originally called the Gibson Les Paul. Later Gibson made was is now refered to as the Les Paul and the original was renamed the Gibson SG. SG stands for "Solid Guitar" because it was their first solid body guitar.
The date of acutal release is unknown but Les Paul Gibson "Gibson SG was released in 1961. Replacing his original guitar that was introduced to the public in 1954. The SG in the newly released guitar in 1961 was known for "Solid Guitar"
No. You should not spend that kind of money on a guitar until you have at least mastered the basics and proven to yourself that you are serious about playing this instrument. For less than half the cost of a Gibson SG you can get the budget equivalent model - Epiphone SG.