Chlorine - 12.5% bleach from Menards for $3.99 a gallon. Add 2-3 gallons every 3-5 days.
CYA (stabilizer) - Natural Chemistry Liquid Swimming Pool Stabilizer (Instant Conditioner) from Walmart online. $30.99 a gallon. Add at the beginning of the year once the pool is clean. Need approx 3 gallons to get CYA to 40. Add all at once, slowly, in from of return. Rinse bottle well with pool water.