The total volume of active has increased in the 60 count version from 700mg to 750mg. Still, on a gram per gram basis your price comparison holds true.
$36 - 90 count @ 700mg = $0.57/gram
$29 - 60 count @ 750mg = $0.64/gram
It looks like both version are available at NP though.
Invalid Link Removed
Invalid Link Removed