i am looking for domain registrar which accepts payment from un-verified paypal account and provide me discount more than 50%.
Try your unverified paypal with name.com 3/4 years back when name.com was awesome I got some domain name with my unverified paypal. You can try them. They always have promo code so google them before you buy. Name.com is definitely a good register.
namecheap.com and internet.bs accepts payments from unverified paypal accounts.