are you wanting to MIG weld it or TIG weld it? also what kind of tubing are you using for your roll cage? if you are using chromoly tubing, you will want to TIG weld it. if you are using DOM or HREW tubing, MIG would work just fine. if you go to Welding Mart - Your Superstore for Lincoln welding equipment and supplies! they have some good deals on some small Lincoln welders. Lincoln is a very good and highly respected brand. any welder that you go with will cost a few hundred dollars. i have seen a light duty lincoln TIG welder for about 700 dollars. and a light duty MIG for about 530 dollars. also just a suggestion, it wouldnt hurt to invest in a good welder for future use. hope this helps.