A few affordable summer scents that I enjoy...
Prada Luna Rossa
F by Ferragamo Pour Homme
Bvlgari Pour Homme Extreme
Also check out Atelier Cologne. 90% of their stuff is citrus based, warm weather fragrances. They have a good sample pack on their website. These would be considered niche, but they come in huge 200ml bottles so the cost per ml is less than $1.