Just a quick search
http://cgi.ebay.com/ebaymotors/Nitro...Q5fAccessories
http://cgi.ebay.com/ebaymotors/LS2-L...Q5fAccessories
I would also recommend a tune (if you don't have one) from casey or nelson performance, a set of br6ef NGK spark plugs, and a purge kit. Once you get the hang of it, bottle heaters are GREAT (but not really necessary at this stage of the game, unless you live in alaska).
I prefer "simple is better" when it comes to nitrous. I tried hooking up one of those fancy window switches when I first got my kit, and had nothing but problems. I have it wired through an 'arm" toggle switch, a 'wot microswitch', and a push button. All 3 have to be active before it works. You NEVER want to spray below 2800-3000 rpm. Spraying through shifts is up to you/your trans. I have done it a couple times, I normally try to avoid it. (I'm riding a stock trans with 170k miles). I would put a 75 shot in it first, get it dialed in, make sure you're comfortable with it, then step up to a 125-150 shot. A wideband oxygen sensor helps for tuning, learning the basics of reading spark plugs helps a lot too. I usually use it on a back country road, shut truck off right after I'm done spraying, slip it in neutral, pull over, let it cool a few minutes, pull a plug, and see what the kit is doing. They recommend changing the plugs every 3-4 bottles. I went through 8 bottles last season, on same plugs, and they still looked new. So that's up to you.
Edit: as far as springs...that's a valid point, but a lot of people are doing it. I've run 175ish through my truck for a few bottles. Pl4yboy has run 150ish shot through a few "stock internal" motors. It's a possibility. You could have a fuel solenoid go out and burn a piston/valve. It could puddle up and blow an intake off. If you're racing your truck, you have to be able to accept if something goes wrong. If you follow 'nitrous rules' it's not as likely, but still a possibility. I personally trust stock springs over aftermarket ones. Aftermarket ones wear out, get brittle, etc. For mild applications, I think stock can hold up fine. I have aftermarket springs laying around for when my cam/new heads go in, but for a stock cam on nitrous, not sure it's necessary.
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