If you're not getting a good deal, you're not looking in the right places.
Yes, the popular stuff is going to be expensive because demand is high right now. But demand
always wanes so it's a game of time. I remember when no one cared about IBM Model M keyboards and I picked them up for 50 cents each because I liked them and no one else seemed to care. Now if you're paying less than $50 for one it's a steal.
One of the best places that I've found to find items is craigslist and then you negotiate. Usually, most people will barely have any buyers so their dreams of getting their 'I saw it selling this much on ebay' price is going to be shattered within a week. Another great place to find stuff is storage auctions and garage sales. And of course if you want stuff in great condition, other collectors. The stuff you find on your own tends to need tlc, and sometimes a ton of it.