Cheap Bus tickets to Roma, US

What are the most popular routes to Roma?

Houston - RomaAverage priceA$98Average duration10h 55mDaily departures5
McAllen - RomaAverage priceA$24Average duration1h 30mDaily departures1
San Antonio - RomaAverage priceA$70Average duration5h 30mDaily departures1
Dallas - RomaAverage priceA$138Average duration17h 5mDaily departures5
Laredo - RomaAverage priceA$36Average duration2hDaily departures1