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Sadly, I do not have an answer for that! Most macro lenses I've come across are in the $300-500 range, so I haven't really tried any. I just use my standard 18-55mm lens with the macro mode on my camera.
But I can tell you from experience that "extension tubes" for macro photos really don't work that great, so I would recommend saving your money for something better. :)
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sometimes just putting a magnifying glass between camera and subject helps.
If you have an SLR type camera with removable lenses, then a quick and dirty emergency macro lens can be made by simply removing the lens and turning it around backward, then holding it in place. Mind you, you need one hand to hold the lens, one to operate the camera, one to hold the camera, and possibly another to hold/position the subject matter. You also need to know how to operate the camera in manual mode as nothing on the lens will work that way round. All in all - I’d only use this method as a last resort - and that is coming from a photographer!Extension tubes are a reasonable (and relatively inexpensive) compromise before going to the expense of a true macro lens - which as Jessy suggested, can start at pricey, and go up to ridiculously expensive.