*Update*
At the time of these previous posts, I was still a virgin and had only tried condoms out while masturbating, I have since had sex on a regular basis and have made a switch to Magnum XLs. There is indeed a difference, a small difference between regular condoms and Magnums, and a noticeable difference between Magnums and XLs. That difference definitely counts when you've been having nonstop sex for a few hours. But even then, XL's will eventually become annoying.
Anyways, the latest box of XLs my girl and I bought were from Walmart and they were $5.95!!!! That's less than half of what drug stores and sex shops charge. Every Target I've been in has only carried up to Magnums, no XLs.