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Hey man go to Sunrise, or any other place that does tire changes and tell them you need stunt tires, they should hook you up for free to dirt fucking cheap. They are mostly old track tires, the edge tread is pretty shot but the center tread is just fine.
First of all, don't go to Scumrise. They will screw you in a heartbeat.
2nd of all, don't go to Scumrise and buy anything. See above.
And if you have a 180 already on the bike, a 190 won't hurt it. It will be more stable in a straight run, but it will be a bit harder to turn in when the roads get twisty. It probably won't even be that noticable since it is on the rear. You can feel a bigger difference if you change the front tire. My old '91 came with 160s on the rear and I put on a 180...barely fit in the swingarm, but it did fit. Worked fine, just had to throw it in a little harder when I turned, but on a long straight...damn it was smooth!!
BTW, you didn't say what kind of bike you have...I am assuming that you have a 180 on there now. Wish you were closer, I would gladly trade the 190 for a 180 I have sitting around! The 190 would look killer on my fighter!