PEQ2's are a good, lower price alternative to the 15. A bit more powerful and a bit longer, but still a great unit. They're rarer now but still go for less and if you keep your eyes peeled they come up. Look for one that's in great shape, no broken knob covers and one that looks used little.
MAWL-C is best civilian one but it's expensive. More than a PEQ2 or 15. Granted you can't get the 2 or 15 repaired but if they're in good shape and little use, know they're potted inside, meaning filled with epoxy so it's kinda hard to damage one if you get a good looking one.
I personally can't compare civilian models to full power ones but some on here can. Good luck!