Subscription Site?

Any good subscription sites out there for comics? I go to scifigenre.com but some of my comics are sold out before they ship, I don't get how I technically reserve them and they sell out before I can get them. Is there a better site then them, or could you guys just name some. And don't name Marvel.com, I went through them before and are great but the mail man doesn't understand when a package says "do not bend" you not supposed to bend.

Any help would be great.