the reasonable guns start around 300-350.. though the TAS velocity arms stuff is not terrible starter stuff, there's better for a bit more. If you are just buying a gun and not factoring the rest of the cost to get proper safety equipment to play, then you need to quadruple your amount.
ballistic eyewear 100-160
extra magazine or two 50-60
reasonably good boots to protect your ankles are optional, but I don't like being laid up for a month or more because I wrecked an ankle.