How do I get into this game?

[fcate]

I have a Master set (the started set) that I got many years ago and I had a few expansions. I'm interested in how I go about getting into the heroscape scene. Everything on ebay is ridiculously expensive and I'm not sure if this game is just going to be a really expensive game. I'm not looking to play super competitively, maybe just at some local events, but I do want to expand my collection so I can have more diverse sessions when I play with friends.