What data type to use for Commerce price field in a rule with a Views Loop (Views Rules)?
Have a look at the Drupal Commerce issue about "Revise the way we handle price amount values". Especially comment nr 37 in it, which states:


  The price field is and will continue to store price amounts as integers ...


So give it a try to use "integer" for your Commerce price field. If needed, also use a Rules Action like "convert the data type" (of that price field) to convert your actual input to an integer.