The price of a single coin is meaningless without taking supply and thus market cap into account. There is currently a coin out there called 42coin. Each 42coin is worth almost $1,000 USD but no-one uses it, no-one likes it, and the coin itself is considered dead. It's only "expensive" because the total supply is just 42 coins. Hence this is why market cap (defined as the price multiplied by the supply) is a much better indicator of the true value of a particular coin than pure price alone.
Nevertheless, out of the coins in the top 50, there are a few that are priced under 100 satoshis. Dogecoin (which I'm sure you're already familiar with) is 66 sats, Bytecoin (an anonymous coin and the first CryptoNote coin) is 3 sats, Reddcoin (a coin intended for tipping on social networks) is 10 sats, and Darknote (a coin similar in features to Bytecoin) is 24 sats. If you think CryptoNote technology is cool then try Monero.
I myself have always liked Qora which is built from the ground up with completely new source code, has the standard set of crypto 2.0 features such as an asset exchange and voting, and has now recently gone open source. There are plans to integrate automated transactions into it as well. It's currently priced at 6 sats but to be completely honest, I wouldn't advise buying any. Why? Well, ever since it was first launched, the price has just kept on dropping and dropping and dropping like a stone. The technology behind Qora and other 2.0 coins like NXT, BitShares, Counterparty, and Ethereum are still pretty neat though.
