When I bought them with the very first batch of EVOs they were 22€ each. I've never seen them in sale, and they have kept the high price. That's exactly the same I paid for the M4 1st gen PMAGs I still use. I broke one of the EVO mags the first week. PMAGs keep going after nine years of abuse.
The very excellent Guarder AK mags (155rd) were 8€ each, and I've bought ten for 40€ not very long ago. There's hardly anything in the ASG mags that justify their price, and quality is not a redeemer either.
If these VFC MP7 mags are something to talk about, they should go for 10-12€ each at the most, and be as well made as Guarder mags.
Then again, we'll see what the real prices on everything around this "AEG" go.