If you’re looking for OOP kits, books, etc. for modeling subjects may I suggest Historic Aviation. I’ve gotten several books from them at a very reasonable price. Jane’s Aircraft of WW II which was a steel at $20.00! Just purchased The Great Fighter Book (608 pgs) for $20.00!
The 'Phantom P-51D (motorized) $50.00 and Sky Captain’s P-40 in 1/18 scale for $60.00! are also available in the recent catalog.
Full of all kinds of military memorbilia (some over priced) but worth a look.
We’re always looking for more refereences and I’ve found this to be a good place to find older books on aircraft at a substaintial discount.