Not sure what RB points really go for. It's 5000 points by the way.

It kinda seems to fluctuate based on the desire of the item, but I can't really tell past guesses. headtilt

There's one in shop search for 50m right now, and I've seen a couple more around that during the past. I sold one before at that price, and it didn't take too long to be bought. It's a well desired wearable.