Need help with Valmet M-78 mags.

Only place I recall seeing them recently was Gunbroker - for outrageous prices - even worse than mags for the 5.56 M76.
Way back, I saw them at Sarco, Numrich, and maybe even RTGparts

Edited to add: last time a 20-round mag sold, it was for $60. A 30-round mag sold for (whoa) $415(!)

A little off topic, but does the 78 take the same top cover as the 76?

If so, I have a couple NOS top covers for 76's that are made to accept Valmet scope mounts...

DM