I will come back here and post a link to where Philebus may be found on the tufts.perseus site, but for now I want to link to what might be the best and most definitive free public domain edition: that by Jowett. This edition has extensive introduction and notes which I have not read, but in linking to pages and line numbers this might be the best way to link to sections of the text on the internet.
Let me be clear: Philebus is very difficult to follow, and I don't claim to have figured it out. It seems clear that there are points which are directly related to Epicurus, such as a very clear question about whether pleasure and pain have a limit. Socrates is very clear that he thinks pleasure does not have a limit, and it seems clear that Socrates things that Pleasure is disqualified from being "The good' for that reason, but Socrates combines this argument with other complicated arguments that seem to hinge on the nature of numbers, and i really don't understand where he is ultimately going with those: something to the effect that wisdom is the most important thing to have, apparently.
Here is the main archive.org page for Jowett : https://archive.org/details/b24750189_0004 and for Fowler: https://archive.org/details/b2900049x_0008 and the main Peresus page: http://www.perseus.tufts.edu/h…9.01.0174%3Atext%3DPhileb.
The start of the section on Philebus in the Jowett edition (extensive introduction and commentary): https://archive.org/details/b24750189_0004/page/518/mode/2up
The start of the dialog itself: https://archive.org/details/b24750189_0004/page/574/mode/2up
Start of the "Limit" discussion - page 593 of the Jowett text: https://archive.org/details/b24750189_0004/page/593/mode/1up This is according to Perseus section 27e.
I intend to do more work on the "limit of pleasure" argument that is found here, and this is the place where I plan to provide page and line number links. (To be clear, I have now changed my mind and will link mostly to the Fowler pages, since that is what Perseus uses and probably therefore is easier to search. We can use Jowett as needed for comparison, because Philebus is a very complicated argument.)