Have you checked department stores? Often times they will have an assortment of atomisers. Just ask the salesladies in the womens perfume department. They may have some in the mens department, but as a lady I only have experience in the womens department, and they always have several styles.
If you'd rather buy online, you can get a $9 atomizer from Sephora...or I just googled perfume atomizer and I got about 159,000 results.