As it stands the subscription for iPad users will cost them $6.99 per month, $39.99 for sixth months and $79.99 for a year's subscription with no option of purchasing single issues. If you'd still like to access their website the good news is that the block is only limited to Safari but users on alternative browsers such as Skyfire or Opera Mini should have no trouble opening the website although it's unclear whether the New York Post will be making a move to block those browsers too, but for now it looks like it's just limited to Safari.
source: Ubergizmo