How much would scaling & root planing cost and should it be done by a periodontist instead of a general dentist?

Prices vary : Geographically, depending on the rent. In some areas it's cheaper - sadly it depends on the area. It doesn't mean that it's any better because its 1200 versus 800. The fee you quoted is on par with my area. Beverly hills would probably be more. A general dentist is certainly well equipped to perform the procedure. Regardless, the procedure is most often done by the hygienist. Hope this help.

Fees vary: You are paying for a professional service, and since fees vary between offfices and locations, it is hard to define 'pricey'. Both general dentists and periodontists can perform scaling and root planing... The choice is yours.

Depends: The most important aspect of the procedure is the outcome of the periodontal therapy. Scaling and root planning is only part of the therapy to control or eliminate gum disease. Depending on the severity of your disease, a therapy includes all possible actions to achieve the outcome. A cost for a single procedure may be pricey, but if the outcome justifies, it may be worth it.

Reasonable: It's common for a fee of $250 or so per quadrant, so that seems ok. The hygienist is probably the one to do the work so you could go either place. But the key is to reevaluate your condition about six weeks after the deep cleaning and perhaps go to the periodontist for that if your general dentist thinks you have an advanced case.