I'd like to get a "Spectre" or "Spooky" into my queue, but I can't find any kits.

Does anyone know if there are any currently or recently manufactured kits out there?

Or do I need to eBay or go to the buy/sell/trade forums?

Best bet would be Ebay. As far as current models ie. airframe mods, you will have to research them and do your own. Nothing out of the box is out there.
Good luck with your build. "Q"

there used to be an Airfix, but they're long gone....

I forgot about the Minicraft offering in 1/144 scale. Just saw one on the shelves yesterday. Other than that there was the 1/48 offering from Testors/Italeri awhile back. Again, I would check Ebay to start. "Q"

I've got the 1/48th Italerai one in the loft awaiting building one day - you may want to try some of the 2nd hand kit sales places - e.g. www.kingkit.co.uk have an airfix 1/72nd, and Hasegawa 1/200 versions listed as in stock( 7/4/2010) - and a C130J in 1/48 if you fancy some kitbashing

Hi Mate,Italeri also did Spooky in 1/72 as a C-130A,i had a couple that i mixed and matched with their cargo versions to make a C-130H.
As for availabilty,that`s another matter - good luck searching,but i hope this gives you another option.