You don't say what your goal is other than cheap, so Here's a few links and you can figure out what you like.
Neil made some great short videos of his mods and maintenance Here's a link to the threads he started:
986 Forum - The Community for Porsche Boxster & Cayman Owners - Search Results
Geraint did some really nice appearance mods & work on his '03:
Ger's 2003 Porsche Boxster S
James made some good videos of his mods for performance and track while he had his 986s:
https://www.youtube.com/@NewArt1/videos?view=0&sort=dd&shelf_id=0
Of course there's many more, but that's a good start.