I have 2 Modified Achromat eyepieces for sale. 10mm and a 20mm. They are lower end eyepieces, but if you insist I may trade directly for your 31mm Type 5 Nagler, you pay all shipping.
All kidding aside, these would make great eps for that up and coming astronomer in the family. I would gave them to my 2 1/2 yr old, but he'd just throw them at his mama or feed them to the dog.
$25 and they are yours (CONUS). Paypal or M.O.