Often parts stores can order this type of tool. You will want to make sure that it fits your model as there are many types of removal tools and not all fit every clutch. The tool is really just a puller designed to fit into tight spaces and is easy to use.
If you have the time for shipping, I would suggest buying online at a site like Amazon because you really can find the best deals. To compare many sites, just put ac clutch removal tool in a search engine.
You can go down to your local automotive parts store and see if they sell this tool or if they can order one in for you. You can also try searching online for "A/C clutch removal tool". This will help you find online retailers that sell this type of tool.