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Are they exactly the same ePubs that you'd buy from the web site? If so, I'm just stingy enough to do this. ;)

I don't know if they're exactly the same but I converted the Tapworthy one and it looked great as an ePub in iBooks on the iPad.

Many are available through the Android App Store for $4.99 as well (with the same export to ePub option).

I use this option, but beware. At least some of them don't offer the export. I forget exactly which book it was, but one of the ones I bought didn't have that option.

I imagine I could go pull the files manually off of /data/app, though.

You don't get access to the full on pdf which I find useful in some cases due to examples and figures.