Matrix
Wait until the fall for the BIG Harrisburg show. There's over 1200 tables in two big rooms. You can find just about anything at that show.
Until then, you can go to the Ft. Washington show and find lots of good stuff. I believe it has around 800 tables.
Lastly, you have to attend the Sportsmen Show out at Harrisbrug. It's definitely worth at least 1 visit or 2 or 30
I'm pretty luck that I live in between Harrisburg and Philly. Either show only takes me 45 minutes to 1 hour to drive to.