An infield machine is the way to go, if you have the money. A good used one will run $6k. On the cheap, build a nail drag. Will cost maybe $100 in materials, easy to do. Just google nail drag and you'll find some plans. A good mat drag is a wise investment. Around $100 depending on size. You can find them on the net, and I know you can get them at Lesco/JDL too, save on shipping.