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If you are looking to see how much your melmac is worth, you can read this post. I am sorry that I cannot answer all of your questions - but if you look hard enough on this blog, I think you will find most of your questions answered.
Small Train or Trolley Collection $4.25 from SpillingOut
I love fantastic plastic toys from days gone by. Those cheesy molded plastic carnival toys or dimestore finds of yesterday are now sought after by collectors. There's a huge market for cars,trucks, molded plastic dolls, vintage toy playsets and more. Some plastic toys are an artful aesthetic that one can appreciate. Often one wants to collect something but doesn't have the room, or the extra cash. Here are inexpensive mini instant collections can be had, most under $10, but all under $25. They are quite impressive ideas to fill a mini-curio.
Five retro neon miniature suitcases from HeyYoYo, $1.95
28 Vintage Little Plastic Cars, Trucks $13 from SpillingOut