No idea on the production runs. I'm wondering about the colored valkyries, like the Max/Millia VF and CF. Do they have to be on separate runs from the white VFs? If so, the chances of a reissue is lower. Or is it that changing color doesn't incur much cost?
On the price, I'm sure it can be lower than US$150, but the sellers have no incentive to do so.
How low can the price be? When the 1/48 first came out, it was available in HK at retail for US$100. (I've no idea the current price.) Let's say distributor price is 20% cheaper, so that's US$80. And suppose you ship by economical surface shipping, those container type, not regular mail, the shipping should be much cheaper than what individual buyers can get. Thus, we'll looking at US$100 + profit.
(All figures are plucked out of my ass. Just thinking aloud.)