Company is not paying money

Hi,

I do software consulting and I'm in Massachusetts area. I did some work for an out of state company that is in Texas. They paid some amount but did not pay the rest. So, they still owe couple of thousand dollars. They accepted to pay at one point of time, now they are denying. It’s been couple of months. If I hire a lawyer, it won't be cost effective for this much money. I thought about small claims court but since it’s an out of state entity, I believe I need to file in their state which again won't be cost effective either for this amount of money since I’ll have to travel over there when the court gives date.
Can someone suggest what my options at this point of time are? I have all the proof through email correspondence that they owe me money.

Thanks