Sure sounds like a bargain, though how good a bargain depends on makers, dates and condition.
This should be said more often, Wolfgang suggested I should make a point of doing so more often, but we have research studies on all these variations and a great deal can be gleaned from progress so far gained. We should encourage new owners to review the studies and where possible contribute their rifles to the research. In just a few years we have made significant progress, - unfortunately most of the progress has been scouring auctions and only in a relative few cases have collectors supplied reports.
Until Craig suggested this course, starting and maintaining research threads, getting a glimpse at actual production and their trends was impossible. Storz's books on the subjects are obviously the best resources to the history of the rifles, development and use, but these research threads give guidance to what can be expected on actual rifles, their dates & ranges, unit marking patterns and progress, and a idea of relative rarity by maker-date.
Lets all try to contribute to Craig Brown's project. Report your rifles where possible, pictures are not necessary, though "accuracy" is and why pictures are preferred.
***hochimin, little can be said specifically regarding the rifles w/o a few detailed pictures, however you can get an idea of what you have by going to the threads that are pinned to the top of this forum, for each variation there are brief variation descriptions written by CB and all known rifles that we collectively had records of or access too. This alone will give a general idea to rarity of each maker-date and how common they are (naturally this is a small glimpse of what is out there, in collections, but should provide some perspective and guidance.)