The Sebring Y-piece (same as Remus, same company, same factory, same fit, interchangeable with Remus/Sebring cans and with the OE can) is about £150 - £160. The same Y-piece from Remus is about £200.
But check out the "For Sale & wanted" Forum as they come up 2nd hand occasionally.
If you are after a Y piece and silencer, why buy 2nd hand when you can buy from us (Moto 46) new for ridiculously low prices. We do not supply Remus stuff, our products are easily as good quality as Remus. Give us a call for prices and info on 01673 844083 / 07810 794848.
Chris knows about site sponsorship, don't worry. I gave him the link to the site earlier this evening. See my response to the y-piece thread in Bargains.