Here's one I just came across that you could invest in for about $18-25.. NEM or New Economy Movement, dubbed the most egalitarian coin.... it's not risk free but the people backing it are well known and not scammers. It's designed to try to let everyone have a more equal piece of the initial coin rather than having the wealthy people with the expensive mining setups getting all the coins and having a very top heavy currency which is the way virtually all the other ones are including bitcoin, where it's estimated the top 2% of holders hold about 2/3 of the coins.
It also has lots of other planned features and is more environmentally friendly being a proof of stake coin, meaning no mining for coins is required. Ultimately it's coins like this that will take over or at the very least supplement bitcoin nicely should crypto currencies survive.
You were looking to invest in something, so I thought I would post this here... it does not cost much and nothing like this has ever been attempted before, distributing the coins in this manner.
You will need an account on these forums, make sure your first post is in the 'newbie' catagory and you may need to wait 6 minutes after logging in to post.
Thread:
https://bitcointalk.org/index.php?topic=440185
For those who are not familiar with alt currencies they tend to get listed on exchanges based on the strength of the community which causes stability in the price through increased coin volume... having such a large base of initial 'investors' will help keep the community strong and provide added value to the currency.