I go to a lot of auctions, estate sales and garage sales.  I find several kits each year.  I never find anything really rare, but I find a lot of neat discontinued kits at cheap prices.  I never know what I am going to find.  This year, I have gotten a Grant King Sprint car, a Datsun 510, a "Woodstock" 29 woody, a Tweedy Pie with the big rear tires and motorcycle fronts )In the nasty folding box) and a Johan 64 Dodge.  I like the looks of that racer.  That 300 would also make a pretty nice Super Stock drag car. Lots of ways to build that kit.  I think that would make an awsome convertible, or a sweet wagon converison.  (Maybe even a pickup version...)  In the last 25 years,  while hunting for models, I have found furniture, wheels for my Cougar, my lawnmower, tools, a girlfriend, a television for the cabin, fountain pens, a dog, a sailboat,  the ugliest table in the world, a job, and a stuffed toy crab that is supposedly worth more than the car I brought it home in.  We both have fun, and we have an agreement.  She doesn't complain about my models and tools, and I don't complain about her figurines, statues and collector plates.  When we get too much stuff amassed, we hold a garage sale to end all garage sales and get rid of all of our buyer's remorse items.  Then we go out and start over again.  
Dave Manley