https://www.lseat.com/products/1997-2004-porsche-boxster-986-custom-real-leather-seat-covers-front.html
Pretty much the only affordable covers available anywhere. You can google for pics of completed seats, many in Boxster threads. The results run the gambit from not so great to pretty darned nice, depending on your skill and patience and hog ring ability.
I haven't pulled the plug on them yet but I have a set of Boxster red seats also, along with 80's Recaro seats that need recovering. I think it's worth the risk and the fact that it is possible to get them to look good with some work, although you will see many sets that look horrible to my eyes. Still, for real leather, no one else comes within hundreds of dollars.