I had the grip-its but they did fall off as they lost their elasticity. I replaced them with the FPS Freek CQC and greatly prefer them as they're concave and attach firmly (though probably dig into the stick plastic which doesn't matter if I never take them off). The added height takes a little...
I have the CQC as well and after an hour or so to adjust I love them. Also have the pelican triggers and they're great too. Just wait till Black Friday or holiday sales and these little accessories usually go for pretty cheap on Amazon. That's when I got mine.
I ordered what turned out to be a backordered black A40 wireless system. They told me they should be in stock around September 10th. My order got messed up, but they have great customer service, fixed it, and gave me free shipping.
I ordered a game once and it took a couple weeks. Sorry, can't be more specific. Try the boards that have all the trivia answers at the beginning of this post. They're pretty active ordering things.
Sorry if this is posted already but I didn't find it in the search.
DJ Hero is $70 online at Toys R Us (unsure if it's available brick and mortar)
http://www.toysrus.com/search/index.jsp?kwCatId=&kw=dj%20hero&origkw=dj%20hero&f=Taxonomy/TRUS/2254197&sr=1
Found via Gizmodo...