Well if $100 is over your budget for an exotic adapter, then my only suggestion would be drilling some holes in a slab of plastic and inserting pogo pins, layer up some alignment tabs to position the chip and with a little finger pressure you should get something to work. Or you could do the same with a generic DFN board just tin the pads, drop the chip on top and apply pressure while programming.

Certainly not an ideal solution but in low volume it should get you by.