You probably will have to look at a 'Bridge' camera, if you after a DSLR you would have to also purchase a range of different lenses if you want to shoot macro, landscape etc. Not sure where you are based, but in uk, if you buy secondhand from a reputable dealer, they quite often give you a 12 month warranty on secondhand. Would avoid buying from Ebay, as you never will know what you will get.
This is a DSLR with dedicated macro lens of one of my tarantulas, but you could get the same result with a bridge camera ( could get in even closer with a macro lens, but this T flicks hairs)
http://1drv.ms/1pRJCje