I sincerely doubt anyone off of Terra is making katanas using tamahagane iron sands, smithed using the exact same hand-done traditional methods used by swordsmiths of Japan going back centuries, in accordance with 21st century Japanese laws regulating the method of production of what are, essentially, art swords that, at times, are used for martial arts practice. Also, folded tamahagane swords are often not as strong as monosteel swords of more modern steel alloys.
Sarna lists the price of a katana at 250 C-Bills. In another thread, we've been discussing the value of a C-Bill, which seems to vary anywhere from $2-11 USD, depending on source and conversion. Wakizashis are priced at 150 C-Bills.
A modern "gendaito" sword out of Japan, whether katana or wakizashi starts in the ballpark of around $2000-2500 USD. That's one basically meant as a cutting practice weapon for students of Japanese sword arts. More artistic swords can easily break $30 thousand dollars. And we're not talking about antiques yet.
Antique swords can vary wildly in price, depending on pedigree of the sword, and where it's being sold. A lower-quality antique with poor pedigree in rough shape that looks like it's more made of rust than metal might only run you $100, but a quality antique can easly fetch tens of thousands as well.
Now...getting into Japanese-type swords made by non-Japanese smiths...prices on these also vary wildly, depending on steel type, quality of sword, etc. I recently had a wakizashi made from what's essentially a "mass produced" 1060 steel wakizashi blade with fittings to my specs, for around $150 USD. It's not as fancy as a more expensive sword, but it's still decent, though some may complain about the balance not being perfect, etc.
So, putting that all together, I'd probably treat the book katana and wakizashi as the more fancy, higher-end versions of the swords, and treat the cheaper versions as regular swords, or even daggers for smaller wakizashi.
Which reminds me...if I recall correctly, it's the full daisho that's restricted in the Combine, with the wakizashi specifically being the more proscribed sword, right? I find that funny, since historically, it was the other way around - only the samurai class could carry katanas, but wakizashi up to around an 18" blade were considered legal for other castes to carry for self defense, and were commonly carried by merchants or other non-samurai during the Edo period.