Easiest=Order an 8.8 from East Coast Gear supply, order a D44, pull a d44 off another jeep...all bolt in options
Cheapest=Pull an 8.8 from a junkyard, buy brackets, and weld them up yourself or with the help of a friend. If you cant weld, you might as well order the axle with everything you want on it from somewhere like ECGS.
If you can weld or have a friend that can weld, an 8.8 is your best bet unless you can find a d44 from a jeep at a great price. Junkyards and pick and pulls should have a good amount of them. You will want the newer axles like post 95 that have the disc brakes. These will be stronger than the pre 95s because they have 31 spline shafts rather than 28 or 29 spline.