One of the most reasonable places to purchase replica Slade-Wallace sets is the U.S. based IMA at http://www.ima-usa.com/index.php
. IMA also has original examples of the kidney shaped mess tin used throughout the 19th century, WWI and between the wars. Theirs is a mixture of both replica and original items but the prices are very good. The Martini I own came from IMA and for the extra $5US it was worth getting a hand-picked item. The rifle I received is in excellent condition. IMA also has a very large stock of the Bakers, Brunswicks and Martini's from Nepal I mentioned in another thread.
From Australia this supplier has some fine replicas (including the kidney shaped mess kit and cover!): http://www.lawranceordnance.com/khaki-a ... ccessories
. In the UK you will find no better or more reliable a place for original items as: http://www.militariamart.co.uk/newsite/home.php
. It is basically an online antique millitaria shopping mall. It can be sometimes tedious looking through the items but many gems are waiting to be discovered.
A terrific U.K. based store for replica Victorian militaria is The Thin Red Line: http://www.users.globalnet.co.uk/~thinred/catalogue.htm
. The stock is very large and the coverage is as far back as the 1850's. Though not inexpensive the quality is impossible to beat. The best thing about Red Line is that the equipment is supplied in the original buff leather, as they state on their site. The white we are all so accustomed to seeing was applied by the soldier for parade, marches, etc. In actual field use the leather was usually allowed to return to it's natural buff color. Here you will find the Slade-Wallace (or more correctly the Pattern, Valise, 1888) as well as the earlier Pattern, Valise, 1871 worn throughout the Zulu Wars, and in the Afghan, Sudan, Egypt, First Boer War, Maori, Kaffir, and on and on... Cavalry equipments are also available.
EBay is not a bad place to find original and replica items, some of the helmets I purchased quite resonably through eBay. There are also a few places where you can get replica uniforms made to order. I'll have to dig for those but I'll get back to you with the contact information. Personally I plan to one day own a complete uniform in khaki, shoes, puttees, the whole lot. Fully kitted out and with my Martini in hand (the rifle not the drink) I think I'm put my wife into hysterical fits of laughter. I don't mind dressing the part and looking a bit silly once in a while.