I know there are lots of companies making pressure cookers of various styles and sizes. Here are soem of the top companies in the market.
If you are looking to buy a pressure cooker make sure to research these companies first. Once you decide what kind of cooker you want then (and only then) should you start thinking about pricing.
Alessi – http://www.alessi.com/en
Cuisinart – https://www.cuisinart.com/
Instant Pot – http://instantpot.com/
Presto – https://www.gopresto.com/
All American –
Of course there are tons of smaller brands out there that are less well known but definitely research the biggest names before you start narrowing down your search.