Dual (serial) PT2399 delay
Two PT2399 chips roped together in series, one with vactrol control, and 4 different feedback paths.
PCB $18
Panel $20
assembled $180
http://nonlinearcircuits.blogspot.com/2013/11/pcbs-for-sale-updated-9-nov-2013.html
http://djjondent.blogspot.com/2015/10/delay-no-more-nonlinearcircuits-build.html
Available as an assembled Module and as a DIY project.
This Module is currently available.
$180