Toy and train fairs can be a good place to pick up bargains, ive had most of mine from there, got a mix of 1/43 and 1/18. Corgi's vangaurds are a nice model for the money too. If you are going to collect the more expensive stuff a display cabinet is a good idea to keep the dust to a minimum, its easy to break small bits off whilst dusting and difficult to glue them back a lot of the time. I use an old 1 1/2" paint brush for carefully dusting them.