If you can't find it locally and are not interested in mail-order, there are a number of DIY recipes here on the site and elsewhere on the web. The simplest way to fake it may be to follow this emergency orgeat recipe which involves almond milk, sugar, orange blossom water, rose water, and rum (or this one which is almond milk, simple syrup, almond extract, and orange flower water) and takes less time than the real thing. But if you have a little time, making the real thing isn't too difficult at all.
If even the least of these is still more effort than you want, you could look for the clear almond syrup that is sometimes found in stores among coffee flavorers.