Alrightee, first off unfortunately "Codename: Sailor V" was not released in English. You can, however, read a fan dub version of it online if you haven't already: http://www.mangafox.com/manga/codename_sailor_v/
Best place to get everything you want is eBay. Trust me, you can get better bargains there compared to Amazon.
With the manga you just have to be patient, more and more people want it now so you'll just have to keep a lookout. It sucks because they are out of print - but there are rumours floating around that they may be re-dubbed and re-released next year for the 20th anniversary... *crosses her fingers* there has also been talk of a (proper) re-dub of the eps including a Sailor Stars dub for 2011 but there still hasn't been an official press release so hoepfully it'll be official soon!
Same goes with the artbooks. Really hard to find... and they're expensive. I only have one >.<
With the movies, you can look on eBay, e.g.: http://cgi.ebay.com/Sailor-Moon-The-Movies-Dream-Set-3-DVD-Free-Ship-NEW_W0QQitemZ370351673241QQcmdZViewItemQQptZUS_DVD_HD_DVD_Blu_ray?hash=item563aae0f99
but you can also find them on half.com - that is where I got my set for 30 USD and it was brand new! The thing with half.com is you have to make sure you contact the seller first about international shipping ecause unlike eBay, they don't openly advertise it.
Also, be careful you're buying a legit set. If you need help in identifying what is legit or not you're welcome to email me ^^