It is difficult to tell from the wording of your post, but I gather you are looking for a barrel only? If so- as strange as it seems, the best prices I have found on Remington barrels were direct from Remington. I just went to the online store and for some reason I do not see barrels listed there anymore, but it might be worth giving them a call. The last one I ordered from them was near the end of this past Summer and the price was better than both Midway and Brownell's Dealer pricing.
EDIT: Found it. Looks like $238.59 for a 28" Remchoke. appears that F,M,IC tubes are included. Item # 24464.
I have a fixed choke barrel for the 1100, 2 3/4" chamber. I am not sure of the choke. If anyone is interested, I will dig it out, take pictures, & list it on the Auctions for a starting bid of $100.00.