Heather,
I think that you should for the most part save up for a dedicated macro lens.
However I know that might take you a while, and I might have a affordable alternative for you.
I have this set of 3 - 55mm threaded Kenko close up filters, along with the case.
I'll rate them in good shape. No scratches or anything.
E-bay sellers would probably rate them as like new
I got them in a $50.00 mystery camera bag with 3 lenses and a few extra items, so they were pretty much free for me, and I've only played with them 2 or 3 times.
If you don't have a lens with a 55mm filter thread you can buy adapters for about $10.00.
I can try them on my 18-55mm kit lens if you'd like to see what they can do.
I'd be willing to mail them to you for $10.00 to cover my costs, if you'd like them.
I could part with the adapter for my kit lens if you require as well, but I'd ask for $10.00 as well. I bought it just to try them, and only slipped it on once.
Before I have anyone else saying that they want them I'm giving Heather first choice.