Mike

Perhaps.

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Note added at 5 hrs (2011-08-14 15:56:53 GMT)
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or
I sell anything I've got between my legs

not vulgar, a bit snappy re: the rhyme and certainly metaphorical -- would this help you?

It doesn't seem to suggest prostitution & it's clear that what's in that well was stashed there --

Spanish term (edited): Yo vendo lo que me sale del coño

Haha, charming on a Sunday! :-)

"Pussy" might be a little less vulgar than the "c" word, and more likely to get a laugh...?

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Note added at 2 hrs (2011-08-14 12:43:08 GMT)
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"...provides me" or "...provides me with" might flow better.

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Note added at 9 hrs (2011-08-14 20:19:30 GMT)
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Another one that just occurred to me is “I sell whatever my magic minge produces”. Slightly cruder maybe, but there's no getting away from the crudeness, if you ask me. Still, makes me laugh.

BTW, this is based on the assumption that you're going into UK English, as there's quite unfortunate differences in this department between UK and US English. "Fanny" is an obvious example.

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Note added at 10 hrs (2011-08-14 21:00:02 GMT)
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Sorry, this answer is all over the place at this point. But something else just occurred to me. That is the fact that in Spanish you often directly reference the question at the start of your response. In this case, if the girl was asked something like: “¿Qué drogas vendes?”; her response is “Yo vendo lo que me sale del coño”. This is often not the case in English, as our natural inclination is to express things more succinctly, so we don’t feel the need to express this direct reference. It’s unnecessary frankly, and I tend to think that it would be left out in everyday spoken English.

So, assuming the girl is asked something along the lines of: “What drugs do you sell?”; my reviewed suggestions are:

<ul>
<li>Whatever my pussy provides me with.</li>
</ul>

<ul>
<li>Whatever my magic minge produces.</li>
</ul>

I'm assuming that by "c##o" you mean "culo." Without seeing/hearing your context in Spanish, I'm going to assume that "ass/asshole" is a suitable translation (even though you state that she smuggles drugs in her vagina). That makes it a little easier to approach the double entendre that you're trying to duplicate in English.