Here's some more general info about the co-ops and the classifieds. You already know that I choose not to participate in either of those venues of the Forum, although it is laziness alone that keeps me from listing some stuff in the classifieds. But I'm trying to present useful information, not a biased attitude, for those who are curious about the co-ops and the classifieds.
Co-ops:
The majority of co-op items come from China, and the actual order is not placed until the co-op is "full". The host of the co-op is responsible for negotiating the deal with the manufacturer, but does NOT reveal to the manufacturer that the items are being purchased for redistribution via a co-op.
The co-op host is not permitted to profit from hosting the co-op. The entire shipment is delivered to the host, and the host then repackages everything for shipment to the individual co-op participants. (It's a lot of work for someone to host a co-op, and when done correctly it's purely an act of love.)
Most co-ops run smoothly. However, the host is unable to do anything about it if there are delays from the manufacturer. Whether the delivery takes 7 days or 3 months (or more), your investment is tied up. Some co-ops do NOT run smoothly.
Generally, you must use a money order, or the method specified by the host, to pay the host for your merchandise. The host sets the rules, but you cannot use your credit card because the host is not an authorized recipient for credit card payments. Usually, you cannot use Paypal either, but sometimes you can.
Classifieds:
The classifieds are member-to-member sales of small numbers of items, usually just one or two. Most often, the items are used but it's also possible for them to be new.
Dealers of any kind are not permitted to run co-ops or to list items in the classifieds.
The classifieds are not separated by type of item. You just have to sift through and see if anybody is selling an item that you want.
You can also place a "wanted" ad for a specific item or items.
To indicate interest, you contact the seller by PM, by responding to the thread, or both.
It was embarrassing. Man I wish I had his setup for DIY. And the 0mg seems to be doing the trick. Phew! He seemed genuinely pleased when told him someone on ECF recommended I go to his shop.
My father was a professor too. I know it ain't always easy. Definitely get together next time then. I hope that will be next April, if not sooner. Too tired to say more right now but thank you for the recommendation and direction. 
