What is the easiest way to implement a parser?

Question

Parsing

The task is this: The site has a block with the latest added products (there are 2 pieces). It is necessary to collect the name and price of the goods in a file. Check, let's say, every 15 minutes and record when changes are made.
Please tell me the easiest way to accomplish this task. And then, on request about parsers, a bunch of all kinds of information and it's not entirely clear where to dig.