Don,
The TwoBobs sheets for the Aggressor F-5s (#48-014 VFC-13 Desert Cats and #48-015 VFC-13 Blue Gray Saints) are listed on their website as "Sold Out", and have been for a while. According to the website, items listed as "Sold Out" are no longer available and will most likely never be reprinted. I guess that means OOP to the rest of us, but with the release of the AFVC Tiger, I wouldn't be surprised to see them back again at some point.
I also wouldn't be surprised for some other decal manufacturers to produce a bunch of cool schemes to go with the new kit. I guess we'll have to wait and see.
The old Black Box stuff was picked up by MMD Squadron. IIRC, they started releasing some of the kits under the Avionix name, but I don't think the F-5 cockpit has been repopped at this time. To be honest, the Tiger cockpit is not all that complicated, and with a little patience and some scratchbuilding, you could probably work some magic on the Monogram kit. You can find some good detail shots of the IP and cockpit interior at
Prime Portal.
I've seen some pics of the new AFVC cockpit, and it looks really good OOB. Again, I wouldn't be surprised if some company - Eduard perhaps - releases a bunch of PE for it in short order.
I'm mostly sure that Academy canned their F-5 plans, but I honestly can't remember where I read it.
In the meantime, I'm really tempted to bust one of the Monogram kits out of the stash and take a trip down memory lane.
-YL