Depends on what you consider low cost. Companies that provide PCB fab services are few and far between to start with. The fab process doesn't get cheap till your ordering large volumes of boards. If you doing a small quantity a set of 10 boards can cost you anywhere from $200 to $400 US. If your only looking to make one or 2 for your own use then i suggest you make it yourself. Either way the first thing you need to do is get some software that will help you to create the PCB layout. There are many free and paid options out there. Here are a couple.
limited in there available parts
http://www.pcb123.com/
Is one of those companies that will fab the board for you.
Once you have your layout completed then have it printed on a laser printer and look up how to etch your own PCB. It would probably be a good idea to make the first one yourself so you can make sure the layout is correct and nothing was missed. It would suck to have a bunch of bad boards made because the layout wasn't quite right.