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Just buy an alarm w/ keyless entry. I don't know about 100 bucks though. I get my stuff through a friend so I don't know what prices are. I'm sure a shop will charge more like 200 or 250.
I bought my stand-alone keyless entry for like $139 installed from Car-Toys a couple years ago. That was pretty much the cheapest I could find. (Brand was DEI, don't remember the model.) It has worked great for the last year and a half!
I bought a 2 way LCD car alarm which looks exactly liike the black widow 2 way car alarm and it cost me 90 dollars...i haven't installed it yet cuz its around 150 to put in but if it works i'll let you know the brand is Astra 777 series