I picked up a white silk one because I was ordering a tie and, hey, they're cheap. You get what you pay for. I haven't been able to use it because its too small and flimsy; just disappears into my pocket.
Go into your local BB store the week before Christmas, find the suit you want, then get them to hold it and ring it up at the sales price the day after Christmas. Perhaps not everyone will be willing to do this, but I've done it a couple of different times at different BB stores.