Your table is really nice, and deserves good quality inlay.
I also suggest you try making your own (more below) but if you decide to buy there are several sources. The Inlays.com look like the best quality, but also more expensive.
(click on Furniture Products then Marquetry - about $25 each)
2. Dover Designs - http://www.doverdesignsllc.com/
3. Acute Marquetry - http://www.acutemarquetry.com/
A lot less expensive, but maybe lower quality?
Also, Freddy Roman, one of the moderators on this forum, makes, or used to make, custom paterae and banding. I imagine you'll pay well for the hand work he does, but it will be highest quality work and historically accurate for your table. Freddy is one of the founders of the New England chapter of the Society of American Period Furniture Makers.
But you really ought to at least have a try at making your own first. The best source of info was a video made by Tommy Mac and Eli for the "crazy leg" federal table, but unfortunately it doesn't seem to have made the cut when the web site was revamped for the Roughcut show (or at least I can't find it). Maybe Tommy will resurrect it if enough of us ask nicely. You'll see a lot of references to it as "ATM 15" on this forum.
Using the video, I learned to make sunbursts and installed them on a Federal tea caddy, which I chronicled in the Play by Play section. While my postings don't go into the detail the video did (because at the time the video was still available) you might check it out.viewtopic.php?f=39&t=1348
If you decide to try them, I'll be glad to clear up anything that's not clear in my how-to. And I'm sure Freddy Roman, who's the real expert, will also chime in.