Cheapest DSP donor?

Exactly what the title says. What is the cheapest least missed game that can be used for it's dsp chip? I know I could go through the whole list and ebay each one but figured that some here who have all ready installed one could make some recommendations. I imagine Krikzz and Stoneagegamer would have some experience here if they don't mind throwing their two cents in.

 

Honestly besides Super Mario Kart there is not a huge difference in price in the games from my experience. I have used all (except SMK) for donors.

 

ballz3d 'nuff said.

 

I found Lock On and Ballz 3D to be pretty cheap. Other than Super Mario Kart, they're all cheap, maybe Pilotwings is a little more.

 

In the UK I have found that the Japanese version of dsp1 games are the cheapest to buy.

 

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Except that ballz 3d is a DSP game (so you can take the DSP chip) and SRFX is not, so you cant. So it makes no sense to mention it in this thread.