What's a good split diopter for the T2i.

It's for some night scenes I will be shooting for my next project, where there is not enough deep focus available. I have been looking around but the camera stores here do not carry them, and not sure what is the right thing to buy online, without getting ripped off, or getting a product that is not quite right for me. What are the best choices, at hopefully not to costly of price?
 
Thanks for the input people. I tried that film riot lens wacking method way before, but it didn't work since I have the T2i, and the camera won't record unless there is a lens attached to it.
 
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