Planetary Pinball appears to have the housings and target in in stock.
http://www.planetarypinball.com/mm5/merchant.mvc?Screen=PROD&Product_Code=PPS-03-9322-1-7&Category_Code=GS-2853
http://www.planetarypinball.com/mm5/merchant.mvc?Screen=PROD&Product_Code=PPS-03-9323-3-13&Category_Code=GS-2853
Yes, a few years ago they were unobtainium. Just say-en