One of the easiest and least expensive ways to meet singles is to spend time where other singles hang out.
Yet, many singles avoid this kind of interaction, either because they've "tried it before and it didn't work," or they feel silly doing nothing while trying to look available in a public place.
Then, make a point of 'greeting' each person who comes in the door, whether with a smile, comment or friendly hello.
There is no need to make your introduction rote or sound like you're working at Walmart though, just try and be yourself doing something that may not come naturally.
It's not only vague, but also the most difficult of places to meet people since you'll never be 100% sure the people you are interacting with are single and looking.
Bus stops, laundromats, libraries, restaurants, bookstores, grocery stores and travel-related places (buses, trains, planes, etc.) all fall within the public place moniker, although there are surely many more to choose from depending on your specific lifestyle.
You've lost nothing in the process, and potentially get to socialize in a lighthearted manner.
A note for heterosexual ladies: attending a sporting event with other single friends will surely net you a conversation with a stranger if nothing else since single women are usually in short supply.
Whether you are taking a couple of courses to upgrade, are a full-time university student or are passionate about tole painting, every community both large and small have courses you can take that will not only net you more knowledge but a whole new set of people to meet and interact with.
If money is an issue, think about taking a class without getting credit or look into how old you have to be to receive free classes, since many universities now offer tuition-free options for seniors.
And while you want to take classes that you have a personal or professional interest in, it never hurts to take something you normally wouldn't - if only because you have a hunch the type of person you are looking to meet would take that kind of class Similar to the hobbies and special interests we all have are our political, religious and/or spiritual affiliations.
The point is this: try not to involve yourself into something so completely that you send off ' I'm busy' vibes.