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The 1999 BMW 3 Series range of configurations is currently priced from $4,400.
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The 1999 BMW 3 Series carries a braked towing capacity of up to 1400 Kg, but check to ensure this applies to the configuration you're considering.
The BMW 3 Series 1999 prices range from $4,400 for the basic trim level Hatchback Base to $12,870 for the top of the range Convertible High Line.
I DON'T know of a kit for the E36 BMW. It's one of those cars for which there is little demand for a kit and no one has bothered to develop one. There are universal kits available that could be adapted to your car, but I wouldn't recommend converting it. The 318i in my experience is quite economical, so there's not great savings to be made, but more importantly it's a breathless little beast as it is, and converting it to LPG would rob it of some of what little performance it has.