It's interesting how many people in the HN comments are on this stuff - here in the UK you can't get it unless your BMI is pretty high. Is it easier to get prescribed in the US or are people just buying the chemicals online?
It's really easy to get them in the UK from a variety of online and high street pharmacies, including from well-known brands like Boots, Lloyds Pharmacy, or ASDA.
As to advertising, my perception is that it's wrapped in a "weight loss clinic" style presentation but you don't have to be on all the sites long before you get to the "buy $GLP-1" here :)