The low, low price of (4)
I believe the answer is:
only
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the low low price of</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for only that I've seen before include "Solely, lone" , "And no one else" , ". . . . the Lonely (sung by Roy Orbison)" , "Merely; single" , "See 6" .)