$2,500 for a wing is ridiculous no matter what.....
If you want a big GT Wing that's popular amongst drifters, look into
BCL:
OR Origin-Lab
Origin wing costs around $900 and BCL costs around $500 IIRC.
If you want a good size duckbill, the only two that I know of are Lux Motion and Leg Motor
Lux:
Leg:
I'm purchasing the Leg duckbill within the next couple weeks.