Ive always paid $20/1k for mixed unprocessed range pickup. Think the last 5 gallon bucket i picked up for $60 but it was mixed caliber and had aluminum etc mixed in. Ive got all my brass in buckets right now and i can fit 4-5k in a 5 gal bucket so 80-100 for a full bucket is probably a pretty accurate price.
Current going rate is around $75 for a 5 gallon bucket of mixed range brass. Caliber specific will run $100 and up. Local indoor range was selling small quantities of brass for $3/pound.