I was buying a big zoom lens for my DSLR recently and accidentally keyed the details wrong into Amazon. It came up and showed me a really cheap set of Macro Extension Tubes. Like less than £10. Here's the link: http://www.amazon.co.uk/gp/product/B001CWZE6A.
Now I had a set of these years ago for my old SLR and used them to do figure close ups, but they were always a bit expensive. However at £7.99 + p&p I thought they were worth a look.
Now you have to be careful attaching them, and it's a matter of judgement how many bits you use for each picture plus it disables your autofocus (not a problem for those of us who used SLRs in the 1980s) but I reckon the next photo shows they're worth it:
This is an Irregular Miniatures 6mm scale elephant, standing on an upturned Humbrol enamel tin. I took it with an 18-55mm standard Canon lens on an EOS 350D, using a 14mm extension ring.
You should be impressed. I am.