Be patient. It is a $650 firearm, but because it holds 15 rounds and is in very short supply the price is more than double. When the first salable production ones hit it was triple the price.
Kel-Tec has never been able to meet the demand of their most popular firearms. The KSG is just the most recent example, but a number of their firearms are basically made from unobtanium. I know some small FFLs that have standing orders in to distributors for some older KT models and probably won't get them for years.