I've been collecting NES since '03, and am up to 610 licensed games, and 21 unlicensed. I think I have about 200ish or so boxed as well. Best advice would be to constantly go to flea markets and thrift stores, as well as buying large lots on ebay for good deals and selling/trading your doubles. Also a *key* word of advice is to constantly monitor the values of games, especially the more uncommon/rare ones so you always have the knowledge of what they're going for at anytime. Also, have a bunch of fun with it, there are a TON of underrated gems that a lot of mainstream gamers have never heard of.