I stumbled upon this site while on my quest for HK P30 mags. They have mags for the above mentioned pistols in stock for between $15-18. They are ProMag mags, but I think this is still a good deal.

 

http://www.gunaccessories.us/high_capacity_gun_magazines_s/54.htm?searching=Y&sort=13&cat=54&show=20&page=1&brand=ProMag

 

They also have factory CZ mags in stock, as well as a ton of other stuff. Worth a look IMO.

That's a decent price. I think I paid $20 a pop for the Wather mags. Just a heads up though; they are great for practice, but I have reliabilty issues with mine. Specifically the last round in the mag won't load.