there are Tons of good on-line shops- visit the 'FabShopHop' list of shops- listed are anywhere from 130-180 on line shops to browse, choose from.
(and in order to participate in the shop hop they are (verified) as legitimate shops
a few of my favorites are
Fabric.com, Keepsake quilting, PineNeedles, BearPaw Quilting, Homestead Hearth, The Cotton Patch (in East Tawas, MI) Primative Gatherings, The Old Country Store, ...the list goes on & on, i've shopped with all of these plus many more over the years.