You will find a large selection of JockStraps at Jockstraps.com.
Here is a sampling of some of their products.  Save 10% on any order using promo code ALLKINK
Free US shipping everyday on orders over $30.  $1.95 flat rate shipping for orders under $30. 
Worldwide shipping available, cost varies.  Jockstraps.com offers the entire range of jockstraps and athletic supporters including fashion jockstraps, classic athletic supporters, and jocks with cups.  They offer major brands such as Bike, Duke, McDavid, Franklin, CellBlock13, PPU, Clever, Pistol Pete and more.