How much are you willing to spend? Here's a few sites to get you started.

http://kiltstore.net/browse/mens-wea...e=highlandwear
Click on the KiltStore ad at the top of the page-There's a 10% X-Marks discount available.

http://giftshop.scottishtartans.org/sporran.html

http://www.leathersporrans.co.uk/Spo...rans-page1.htm