Randall: I got them at the local dealer. My wife had been Boxsterless for nearly 2 weeks while I figured the problem out here and there so I just went down and picked it up. The reservoir was $255, the cap was $17 and the coolant was $44/gal. If you are a member of PCA they give you a 10% discount and those prices are after the discount. Compared to online suppliers it was about the same price. If it's a big difference at Sunset, please let me know. I'm ordering future parts needs soon.
Tom: It's not too tough if you lift it high enough. I had it about 21" up so I could be on a creeper. It took me about an hour to get it out after the car was lifted, the carpet was removed and the engine compartment was opened, two to get it back in. The most difficult part was getting the new hoses connected from the tank to the metal tubes. I found a couple of things that were much easier to do than explained in other posts. I'll post the whole process on my website when I get a chance in the next few weeks. The only tools you need are a ratchet wrench with a 10mm & 15mm socket, regular size pliers for the clamps and a screwdriver for prying. Air tools really speed things up underneath when you pull off the tranny cover.
It took me the whole weekend to do it because I am anal about everything to a fault and I was working on a couple of other things too. I clean every part I take off thoroughly and take pics as I go in case I forget how it goes back together. I also decided to replace all of the hoses that go from the tank to prevent having to take it out soon due to a busted hose.
I went to NAPA and bought 2' each of high pressure heater hose in the same size diameters. I also got 5' of 8mm high pressure fuel line since heater hose does not come in that size. I cut the pieces I needed to size and replaced all of the hose I could along with the clamps. Not bad as the hoses I replaced are $100+ at the dealer, $7 at NAPA. The only difference is my hoses don't have part numbers stamped on them. I'm ordering the two large hoses and the 3-way hose that you can't get elsewhere some time soon so the next time I have the covers off I can replace those.
The final thing that took awhile was I filled the system slowly with water to pressure test it under running conditions before the covers were all put on. After warming it up to 195 degrees and seeing no leaks I let it sit over night Saturday because overnight was when I was losing coolant. When nothing leaked, I drained the system again on Sunday and then put in the liquid gold.
The dealer (Hennessy Porsche in Alpharetta, GA) was very helpful when I picked up the parts. I wasn't sure about the amount of coolant I needed and the special tools listed on AllData DIY. The parts guy asked a tech about filling the system and he told me how to do it the right way and keep from having air pockets.