Dear employeer,
I'm a software engineer and I don't want to promise that I'll do everything perfectly on PHP like others may do according to the fact you set your project into PHP category.
Why ?
-To extract data from 1,800 links. This bulk link search tool has to be a multhithreaded application. It means that it can extract many data simultaneously. PHP doesn't manage multithread natively as it needs an extension written in C to do that. So we need other technology to make this search tool efficiently.
-Some websites may have Excel Sheet to store products information. It has to be handled too.
What I can do :
-Create a ".NET" software. You can add any links you want and change links every month.
-Add currency column if the 1,800 links are not all based on the U.S. and implement other functionalities if needed.
-Software can export Excel Sheet as you mentioned and can also save the extracted data to a webserver.
I want you to be sure that I can do the project! Before awarding me the project, please send me 10 links to let me send you back a starting software within 2 days. So you can see if the software is acting as expected.
I'm a honest developer, I just say what I can do. I guarantee that I'll be there for many years if you have any improvements according to this tool. I'll give you source codes so you'll know exactly how the software works (no secret or undesirable code).
So I really hope that I will work for you for this project.
Thanks & Best Regards.