You can buy a six pack of Tortoises at MB Klein for $90. That is $15 per Tortoise.
Let's say you buy six servos and the controller board(s). What would that work out to in terms of cost per turnout?
In low quantities it works out to about $26 per turnout for a servo, control board and mounting hardware. This is based on the Tam Valley Depot singlet system that I used. The control board is a DCC static decoder and panel LED/button system in one. So for that money you get everything needed to bring the servo under DCC control and display the output and manually control it.
The $15 Tortoise will still need the static decoder, and any switch and panel indicators to provide the same functionality. When I priced this out some months back there was considerable savings going the servo route and they are much smaller. Time will tell if they hold up?