What is the price (usd) for the model pq32mu?
CREATE TABLE "references" (
  "manufacturer" text,
  "model" text,
  "intro_date" text,
  "interface" text,
  "os" text,
  "price_usd" real,
  "price" text,
  "throughput" text
);
SELECT MIN("price_usd") FROM "references" WHERE "model"='PQ32MU';