You can get an IPv6 range from your ISP, or directly from the central authority in your region. (IPv4s are too scarce to get a range, so you'll only want to have one and that will have to be part of your ISP's range because you can't advertise just one.)
Purchasing wholesale internet bandwidth is another way of saying purchasing internet service (a lot of it). The company that sells you that is your ISP.
You can get an IPv6 range from your ISP, or directly from the central authority in your region. (IPv4s are too scarce to get a range, so you'll only want to have one and that will have to be part of your ISP's range because you can't advertise just one.)
Purchasing wholesale internet bandwidth is another way of saying purchasing internet service (a lot of it). The company that sells you that is your ISP.