I've been looking for a cheaper solution and found this link. www.tvserviceparts.com My son broke my Samsung 55 inch Smart TV UN55H6350AF LCD Panel by throwing the remote at the TV which I found on www.samsungparts.com for $676. Hope this helps.
Excellent replacement, just like the original circle pad. The write-up and pics were very helpful. Highly recommend for anyone needing to buy and replace the circle button on a 3DS XL.