I'd suggest looking at one of the A2 capable printers ...
+1
Just another, little point to consider: As soon as you print yourself, you might not only enjoy full control over your creative workflow, but also full frustration if something goes wrong :-)
For me (YMMV) the total cost of printing inhouse was much higher than working with an external lab. All in all, it took me years to get (and understand) all necessary info on proper file preparation, monitor and printer calibration/profiling, and viewing conditions (not to forget all those nasty software bugs and hardware issues I didn't recognise as such, being a trustful greenhorn.
(BTW: Big cudos to all of you great guys, sharing your knowledge here at LuLa. Couldn't have made it without you!)
But in the end, it pays off, of course.
Today I can offer high end printing services to me and my clients, based on a proper foundation of knowledge and experience. Thus we get images that are not only a coloured sheet of crappy plastic (sorry, RC papers

) but a carefully crafted expression of the photographer's emotions on precious materials you'd love to touch.
In my experience, you can't buy that in a lab. And if you can, it's expensive. So, better learn to do it yourself!