WHAT price beauty? For Iris Grosso, 54, a divorced office manager from Great Neck, it was $20,500, which covered the cost of the face lift she had in August and the tummy tuck and liposuction she had in September on her thighs, stomach and knees. That doesn't include the cost of removing the bags under her eyes and the brow lift she had in 1993, or the nose job she had at 16. She said her mother paid for her first operations and left her some money after she died that she used for her recent surgery. ''I talked to my mother at the graveside,'' she explained, ''and I knew she'd be happy I was doing this.'' ''I hated my parakeet nose and everybody saying 'Polly want a cracker?' to me,'' Ms. Grosso said, ''and I always hated the bags under my eyes that I think I was born with. When I got...