The Brenda White charger plates are about 18" in diameter, 3.5" high, and are about 1/2" thick ceramic. They are hand made and hand painted. They also tend to be very low edition sizes.
Before Brenda was well known many of her plates were at the (early) Disney Stores. For example, the AP she has up for sale now (Sorcerer Mickey) sold for $250 in 1990 and was an edition size of 50; most of her plates were editions of 25.
Later on, her prices did go up. For example, at the opening of the first Disney Gallery Store (in Santa Ana) her LE/10 Cheshire Cat was $1,500.
I know these prices as I have 17/50 of the Mickey Sorcerer and 7/10 of the Cheshire Cat. Luckily, at that time I was able to get a 10% discount with MKC.
By the way, anything you see on ebay with "JRBW" as the seller is coming directly from Brenda and not a reseller.