Thumb Score: +5 Amazon [amazon.com] has 4-Lb Clorox Pool&Spa Swimming Pool Chlorine Stabilizer for $12. Shipping is free with Prime or on $35+ orders. Price: $13 lower (52% savings) than the list price of $25 $8 lower (40% savings) than the previous price of $20 *Previous Frontpage Deal at $13.55 with +50 Deal Score and 45 comments.