Amazon has 32-oz Bissell Professional Spot and Stain + Oxy Portable Machine Formula for $6.27. Shipping is free w/ Prime, otherwise free on orders $25+
- also available at Walmart for $6.27
- You can also get 2 for $10.60 when you scroll down to bottom of product page where it says Buy Together & Save and click Add All to Cart. Select store pickup to save on shipping, otherwise shipping is free on orders $35+ (thanks gbz)