>>56151 (OP)
For diapers available in-person in pharmacies, Walgreen's Certainty is quite a bit better in regards to both quality for price and price when being compared to any similar product available in pharmacies. However, absorbency does not compare favorably for Walgreen's Certainty when comparing it against internet-purchased alternatives that are widely available, either medical or non-medical.
That said, the best time to purchase Walgreen's Certainty brand is when Walgreen's runs a regular "Bogo1/2 off" sale on them, or where you can buy one package of them and get a second package for half off, 80 briefs for roughly $30 (if buying medium).