Crossword Puzzle Like the lowest sale prices

Clue: Like the lowest sale prices

Mark sale prices (RETAG with 5 letters)
Mark again, but with sale prices (RETAG with 5 letters)
Lowest balcony in a theater (MEZZANINE with 9 letters)
Marks sales prices (RETAGS with 6 letters)
Not the lowest prices (RETAIL with 6 letters)
Like sale prices (LOWERED with 7 letters)
Theater gp. (ANTA with 4 letters)
ID to guard from identity theft (SSN with 3 letters)
Things that are hard to walk on, and this puzzle's theme (TIGHTRS with 7 letters)
Like theremin music, often (EERIE with 5 letters)