My older volumes are of type "standard", but that type is not on the price list. I cannot even send a link to the price list, because the region is not in the URL. https://aws.amazon.com/ebs/pricing/ Complete lack of transparency.
Unless you're specifically looking for high-IOPS or massive HDD volume, you should just default to "gp2" SSD volumes these days.
https://aws.amazon.com/ebs/previous-generation/
Also easy to see on the pricing calculator