There is a solution for you!
There is a website, Cex.io which allows you to purchase gigahash per second with bitcoin. The best part of this is that the "rental" is actually for life. Meaning if you buy 1 gigahash for 0.02 btc today you can mine with it on their site forever. As blocks are found users are paid for their Ghash, you can actually see the mining stats live on ghash.io.
As always, I recommend buying bitcoin through Coinbase, the safest way for americans and probably anybody to purchase BTC with a bank account. Take that btc, buy some ghash with it on cex.io and thats it, you're done, you're mining bitcoin without having to buy a ton of hardware and hook up cables all over your house. You're immediately paid when a block is found, and ghash.io does merge mining with devcoin, ixcoin and namecoin so you get all those added into your profits as well!
But the best part of this? When you've made back your investment and some profit and you've had enough, you can sell your ghash at the market rate and get paid for the hardware, being as you own it, its yours to sell.
Check it out here: