Spenceroo,
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My experience with Sleeve City (Sleevetown) has been much different than that of Emailist.
For me they have been terrific and give great customer service. All of the sleeve sellers by in bulk from manufacturers and can have production or packing problems from time to time. I have been working with Sleeve City for 4 years now, had one problem (I mis-ordered) and they took back the sleeves with no hassle and replaced them with what I meant to have ordered.
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They will also give you a bit of a discount (around 10-15% , cant remember exactly) if your make a larger order.
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I have tried several inner sleeves and found the MFSL to be by far the best. They also have a nice advantage of having some printing on one side that directs you to the opening in the sleeve (seems small, but a nice convenience). They are a bit more expensive, but well worth the money.
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The best outer sleeves have been the Poly pro 5 mil polypropylene. They are clear and large enough to let the LPs easily drop in and handle the double LPs as well. They happen to be on sale now.
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Below are links and the product description they list on their website for both the Inner Sleeves and Outer Sleeves that I have recommending.
Information for the Inner sleeves
http://www.sleevetown.com/lp-sleeves-inner.shtml
Mobile Fidelity Master Sleeves - These are the same high-quality inner sleeves used by Mobile Fidelity Sound Lab for their vinyl releases. They are imported, three-ply, anti-static, premium sleeves (similar to rice paper) and work with both LPs and laser discs. Back construction consists of a paper layer sandwiched between two sheets of high-density polyethylene (HDPE) with a translucent HDPE front. This equals or surpasses the discontinued VRP inner sleeves.
Information for the Outer sleeves
http://www.sleevetown.com/lp-sleeves-outer.shtml
SALE! Ultimate Outer 5.0 - a clearly better outer record sleeve that doesn't get cloudy. Manufactured from crystal 250 micron clear polypropylene, sleeves fit loosely over outside of jacket, 12.75" X 12.75". Our heaviest weight outer sleeve, yet it retains the sparkling clarity of polypro. Price decreases with quantity. Get a sample for only a penny!