Be happy to play small games. 1000 points can make for some really fun, fast paced games, especially if you stick to 4'x4' boards.
I'm certainly not disputing what others have said about low model count builds and eBay being your friend, but if those armies aren't your thing and you just can't find what you really want, there is nothing wrong with building an army up slowly over time and either asking your opponent for a smaller game, or asking a friend if you can be an ally to their force.