Organising that is the difficult thing. Packing and posting one jiffy bag to a friend or acquaintance is fairly easy, repeating that 100 times, and attempting to get everybody who can afford it to reimburse you for shipping costs is a royal PITA.
However there is a hobby business opportunity here. If someone is willing to act as a regional coordinator, receive donated parcels of parts from members for points credit, EBAY approx 50% to cover costs, their time and a moderate profit, and maintain a current stock list with pack weight, pack quantity and points per pack for each entry.
Members could use their points to order stuff from the stock list on a first come first served basis - flat rate no. of points for any order up to a max weight, + points for each pack of items ordered, or buy by paypal if they don't have enough points.