Welcome to the forum!
I'm in central NJ and I use mail order from Heinecke in Wisconsin for basswood and butternut.
http://www.heineckewood.com/
Tell Dale what you want, he'll ship it, and while you're carving it, you'll probably get a bill, and you send a check back to him. A lot of people use him--great prices, great wood, great people to deal with.
I go to my local lumberyard but he only has 3/4" and 1" basswood, not great quality, and limited amount. I also use eastern white pine--my preference to carve--what I can get from Lowes or HD and glue lam what I need. Works for me.
I've also used Groff & Groff in Maryland--I got poplar from them mail order--they have quite a selection of different woods.
http://www.groffslumber.com/index.html
If you're up in Northern NJ, you might have a better chance getting something. There's not many lumbermills around here any more. I'd have a better chance with getting free wood--old pallets, firewood, etc.
Good luck!
Bob L