Not necessarily limited editions. Tamiya's F-14 Tomcat and P-38 Lightning are fantastic kits yet pricey. Are they worth it? Absolutely. 1/48 and 1/32 scale aircraft kits can get expensive - Hasegawa, Tamiya Hobby Boss, whatever. Even high quality armor kits can be pricey depending what you're getting.

1/350 scale naval ships are stupid expensive while 1/700 are not.

That's why it pays to shop around in various online hobby shops. Look for sales. Holiday shopping season is coming in a couple months - so watch for sales especially Black Friday specials.

Attending model shows is another great place to find deals. Vendors can give you deals because they want get rid of them and less to bring home. Raffles is great way to get model kits too.

Look in garage sales, antique stores, and thrift stores. I've picked up a few for less than most eBay sellers.

eBay is another good place to look. Find something that piques your interests? Click on Watch List or make them an offer. Sellers will often will accept or make a counter-offer. If you choose Watch List, they will come back and put in an offer less than what they're asking on the listing.

I usually avoid bidding. I never or rarely win.

Another Wild Card place to look is… believe it or not…. your local Craigslist.