Hey Man,
The Xbox One X (Black - 1 TB) is showing $499.99 for me (and that is the only one available that I am able to find on the site):
https://www.toysrus.com/product?productId=2E206E12
I probably spent about 15-20 minutes on the Site (about as long as I can "go" on that clunky/clunker site); if you or any fellow CAG knows off the top of your head and/or can easily access an online link for the $399.99 XOne X, I would really appreciate it. I bought 40 of the codes (so I am going all in)...
Edit: I just realized your OP was from 6-7 hours ago, hence, why I am looking around

for something that isn't there (on toysrus.com).
On a side note, I am thinking there are literally thousands of these TRU $10 for $7.50 codes on cardcash.com; the "ticker" was at 9996 when I started and at 9956 when I ended; I went back several times over the past 10-15 minutes and it is resetting at 10000/9999 consistently. Just an FYI