No, soda lime and baking soda are not the same thing. Soda lime is used for anesthesia and scuba diving rebreathers. I found some here, which will give you a start: http://www.shopmedvet.com/product/soda-lime-3-lb-bag/jorgensen-products-anesthesia-products
Just a word to the wise. Anyone planning on using soda lime PLEASE use the proper precautions. Soda lime is a mixture of extremely caustic chemicals. If you get any on your skin, it will immediately burn you. With the addition of moisture it becomes very viscous and is extremely difficult to wash off. Wear protective gloves, do not breathe any of the dust and if you do get some on you wash for a minimum of 15 minutes with cold water.