As Peter pointed out in the thread iwire linked to, there is a guy on the JLC forum that makes his own blades and sells them for very cheap. The members on JLC that have purchased blades from him have reported that they work as well as the Fein blades. I have one of the older Multimasters that will accept blades with a simple hole so I'm going to buy from that guy the next time I need wood blades. I would imagine that this style tool that doesn't require start blades is still available new on ebay.
I agree with most of the comments posted about the Multimaster - it's slow, it's noisy, it's expensive, but it works very well at what it does and there's no substitute in some cases.
As for the cost, think of it this way: There used to be three levels of power tools - cheap homeowner stuff (like the Black and Decker $20 cordless drills), professional tools (Milwaukee, Dewalt, Bosch), and really good professional tools (Hilti, Fein, Festool). The first category of really cheap stuff hasn't changed much in the last 5 years. The Milwaukee and Dewalt I know first hand have decreased in quality in the last 5 years. Standard Dewalt cordless tools use plastic gears unless you buy the XRP series, and I've heard the newest Milwaukee cordless isn't as good as the older series. If you buy Milwaukee hole shooters and Sawzalls make sure you look at a full catalog first and buy the more expensive ones - the bottom few models of drills and sawzalls have less powerful motors, shorter stroke, 2 stage gear reduction instead of 3 stage, and so on because the low end is sold through home centers. There's a reason that the costs of the Milwaukee and Dewalt cordless tools hasn't risen with inflation in recent years - they're making them cheaper instead of raising the price. The price of the higher-end sawzalls and hole shooters has gone up because they're maintaining quality.
Anyway, with the sporadic declines in quality of the so-called professional tool lines it's becoming easier for me to justify the more expansive brands such as Hilti and Fein, and Festool for woodworking stuff.