You can get one at either Harbor Freight or Northern, or, another option, you can buy one ready to go at Tractor Supply for about the same price. That's what I did. It's an 8X4, ready to roll off the lot. I bought mine a few years ago, but I was just in TS the other day and they're still available for around $275.
Just another thought. Good luck.
Brian
"I'm not talking to myself; I'm conversing with one of the myriad of voices in my head!"