A little general info on transfers/servers:

You will never "change" server - unless the software is changed in the future, you stay on the server you initialized the game on.

You can only buy players on that server, they must be 3*-5* from your view, unless you go to Mr. Scout.

The Negotiation List is automatically chosen (an important note, these managers for the most part didn't choose to sell them, so a substantial offer is the only way to get their interest) over a group of servers, so you may not be able to offer for all on the list.

Mr. Scout is shared! So if you really like a player, don't wait, someone else could get him!

The regular Transfer List is on your server only, so it depends on how many people above you are selling for what you see, plus the software will generate players when there are fewer on the market, your best best for finding the gem gens is when your server is slowest (mine is 1-6 a.m PST best time, I am on an Asia server I think) they will be from silly team names, you can find them all ages, but younger train faster.

Hope that helps ya'll.