And they are a lot cheaper than the bullsh#t prices some are asking on eBay.
There's a thread either here or the LFPF about the planned new processor, slightly upgraded version of the CPP2, price "under $3k" if I remember correctly, which probably means $2999 if they hit the price point. Pricey, but still.. the old one was about $2k new years ago, wasn't it?
I'll see if I can find the thread.
There are a few resources in the US for parts and drums (as well as a plethora of used gear on ebay...) - check this out to name one:
A great learning tool for 4x5 is shooting Fujiroid. Get one of those pack type polaroid backs and invest some money in instant fuji film. Then go around willy nilly taking pictures of anything and everything for awhile and get the instant feedback. This will make you comfortable using the camera.
I shoot "Fujiroid" some. Be aware that the 4x5 Fuji instant films have been discontinued though some is still available. Plus the cost is about three times that of the 3.25x4.25. I find that size close enough to be very useful. The Polaroid 405 back is the one you want - not sure about an equivalent Fuji back but there probably is one.
I found this useful for me...
In addition to AAs books, which got me started in LF years ago, come to think about it, I also found two other books useful: Leslie Stroebel's "View Camera Basics" and Steve Simmons "Using the View Camera". I also enjoyed browsing Jack Dykinga's "Large Format Nature Photography", though most of the key info is in the first two books.
Needless to say, Ralph Lambrecht and Chris Woodhouse's "Way Beyond Monochrome" 2nd edition is a great compendium of all the other things one finds useful when using a view (or any other) camera. I go back to it all the time.
Regarding the availability of Jobo equipment, new (not 2nd hand) Expert Drums, and CPA-2 and CPP-2 processors, with parts, can be bought in EU from http://www.fotolaborservice.de/, I corresponded with Klaus-Dieter Seynsche there for info about those.
I've started processing my sheets in trays. Used to use a Paterson Orbital and then a Jobo CPA2. I can't imagine not using trays again.