DS in first grade got the following scores on his Fall NWEA MAP:
Reading 219 (99th 1st; 99th 2nd; 97th 3rd); math 198 (99th 1st; 94th 2nd). DH and I are trying to determine whether to spend the $1000.00 to have him IQ tested. We only want to do this if it will provide him additional opportunities in the future.
Anyone with scores like these end up with an exceptionally gifted IQ score?
I would say that at this age, DYS doesn't have much to offer (let me rephrase: "as much to offer as it does to older children"), so that's not a reason to test. If you don't have any idea what resources it would open up locally, it's not a reason either-- especially because some programs are picky about what tests they'll accept anyway. You might feel silly having spent $1000+ on decent testing only to have a program administer a group test which is required for admission.

Regarding DYS, later on you may find it easier and much cheaper to use a test like Explore to gain entry.
Looking at your posts from February 2011 combined with this one, though, I do see some good reasons to test. The drop in scores experienced back then might indicate some learning issues, and at least indicates that the educational fit probably isn't the greatest (which impressions are heightened by the fact that despite his superior scores in math, he increased only 8 points in 3/4 year, which is slower than expected). In addition, a verbal score increase in 3/4 year of 25 points is much more than expected, and definitely not due to anything the school is doing with him. Testing could well help you in advocating for acceleration at school, and help you understand more about your son.