With that, you have a couple of options. Instant gratification, I can ship it off in a mailing tube tomorrow or Wed. Or, you could give me a week and let me mount and mat it. That option will require a little extra shipping fees- but could save a *bundle* when it comes to getting it framed (we have more matting at work than we know what to do with. I can make it look *good*, man).
I leave it up to you- the size of the paper is 18x13 3/4, so it's pretty big. Having me do the matting for it will make it considerably larger- not necessarily bad, but not exactly the best for shipping purposes.
EDIT: Or...... You could let me *really* save you a buttload (about $300) and let me frame it. Cost of materials and shipping. I have a specific way I like to do my watercolors (I prefer to show off the handmade paper), and in this instance, this piece will fit nicely into a 16x20. Again, it's something I can do on my off time, so give me about a week, and it's done. This also has the benefit of me knowing you won't be sticking it to the wall with thumbtacks

Drawbacks definitely exist, but in the long run it'll save ya a lot.