Summer Pig Roast - Caja China?

I'm a three year Chicago transplant from California and this last winter almost made me pack up the bags. My lady and myself thought such a bad winter needed a really good bbq to kick off the summer right. I've been looking into pig roasts and was looking for some help. I have a workable list of pig purveyors and don't need that but I would love to use a caja china if someone knows of a place/person to rent one. I've searched the web and think it's a bit too pricey to buy one and don't trust my skills to build my own (maybe after my first one). So if anyone has any help in locating one I'd appreciate it. Thanks in advance.