Well if it was three or four decades ago, we could give you some pretty good spots in Jersey, PA and New York, two decades ago it would start to get a little dicey but somebody would probably have it, one decade ago, Maybe, but today???
I could go down memory lane and tell you about all the great spots from yesteryear. Those threads are always nostalgic but off topic.
You can try calling White Dot Electronics, just Google them, they are at Rt 206 and 38 in Vincentown, New Jersey, the last I heard besides running a soft serve ice cream store they did do stereo installation and CB repair and installation Etc in their parking lot back when CB was popular. They sold scanners and accessories, today I don't know but I understand the vanilla and orange twist is a really big hit.
You can also Google HRO in Delaware, they're not too far from the southern New Jersey border, pretty far from you, nice store to visit and if they have them in stock that's probably the only place I can think of that's actually going to have the radio available today on your day off. Having an open box unit, I don't know.
Probably your best bet would be to start googling in New York. You never know, maybe somebody in New York City or Long Island.
It was sad for us all to see the brick and mortar stores go but for them to keep expensive scanners in stock, a few at a time, it's hard to make a profit and keep the lights on when you're competing with the online scanner dealers who buy the scanners in bulk.
Best bet is to use a reputable dealer online who have a 30-day money back guarantee. Be very careful with custody of the packaging, if you're not satisfied then you can just return it, you may or may not have to pay a restocking fee.
Good luck to you and let us know if you're able to purchase a SDS 100 today, I'd like to hear about the store you get it from.