You could make it yourself...
(NOTE: This, like many other chemistry experimentals, can be dangerous. The nature of both Diethyl ether, and Sulfuric acid are potential hazards to your safety. Don't attempt this without the proper safety measures in place! Be ready in the case of fire or toxic spill.)
Get you some 100% Ethanol solution or as close as possible anyways...(Denatured alcohol works fine unless u need super purity), and concentrated Sulfuric acid (at least 90%). Both can be found at your local hardware store or chemical supply house -- Ethanol as denatured alcohol and Sulfuric acid as drain cleaner.
You also need, for this experiment:
1 sealable glass vessel (glass bottle, for instance - preferably clear)
1 vessel for use as an ice-bath.
1. Fill the larger vessel with a good amount of ice, and add some water. This is your ice-bath.
2. Place the sealable bottle into the ice-bath.
3. Add an amount of Ethanol into Vessel 1.
4. SLOWLY add drops of Sulfuric acid to Vessel 1. Add a few drops, and seal the container. Shake, repeat. Note that this reaction is exothermic and generates a good amount of heat. This is what the ice-bath is for. The reaction temperature should stay below 34.6C, and MUST stay below 130C -- otherwise Ethylene will be formed, not Diethyl ether. Generally if the acid is dripped in slowly enough, and enough ice-water is present to keep the reaction cool, this is not a problem.
-Make sure that after each addition, the bottle is re-sealed while it is cooling again. The boiling point of Diethyl ether is 34.6C (94.28F), and we don't want to lose our ether to the atmosphere.
5. When the reaction is complete, distill the contents of the cool, sealed vessel to a temperature between 35C and 78.4C (BP of Ethanol) over a spark-free electric hot plate. Or, as a safer alternative one may use hot water to distill the mixture. Utmost care must be taken not to generate any sparks/friction during this distillation - as Diethyl ether is very flammable. Collect the ether from the product vessel.
Your ether should be of high purity, with any traces of other chemicals likely being small amounts of Ethanol - that risk increasing the higher the distillation temp was. Sulfuric acid's boiling point is 290C so it is not likely that any should remain in the final product.
It would likely be hard to separate the Ethanol and Sulfuric acid since Ethanol forms an azeotrope with water at 95% conc. or so, and Sulfuric acid needs a small amount of water to prevent fuming.
One more note: If Denatured alcohol is used, it is possible that a small amount of Di-m-ethyl ether (up to 4%) will be formed as well. However, this substance is a gas at room temperature and thus should evaporate quite readily.
1. Have Sodium bicarbonate (Baking soda) on hand in case any Sulfuric acid spills. In the case any spills onto the skin, pour an excess of Sodium bicarbonate on the area immediately, THEN wash the area with water, then soap. Rinse off, and dry thoroughly. Concentrated Sulfuric acid reacts violently with water and that is a reaction you don't want on your skin.
2. Have a fire extinguisher, or at least some water, on hand in the event of a fire (which is very possible in this experiment.)
3. A gas mask or fume hood is recommended but not required. Diethyl ether is not toxic in small amounts but is intoxicating. Sulfuric acid is toxic but is not likely to become a gas during this reaction. Basically the best advice is to not breathe any fumes from a chemical reaction (ever.)