There are some very silly priced stripping baskets out thre..very silly indeed!
If its for river fishing and short casts, then you won't beat the Wychwood one at around a tenner. It great for keeping 10-15 or so yards of line out the water around you feet.
However, if like myself you tend to clamber over rocks and need long casts, the the ones with flexible "prongs" are the way to go. I have one upstairs that I picked up for about £20, but I have no idea who makes it. Its a ridged "tray" with either loops or prongs, its up to you how you want to configure them.
If you do not mind looks, make one out of a washing up bowl