If you buy an S-Builder Co-op unit you can pay full price and reap all the referrals, or you can co-op the co-op and let your CSAs and PSAs split the cost and you split the referrals with them. This gives you a certain measure of control over the division of cost and benefits. (I recently bought an S-Builder Co-op unit and shared it with two people as a thank you. I paid the full price, but share the referrals. It is a reasonably priced way to do something for someone else.)
Another member who has co-oped the co-op may offer to sell you shares which would allow you to participate in the same S-Builder Co-op advertisements, but at a lower cost and consequently with a lower benefit. I think this is a good way to "get your feet wet", especially if funds are not readily available for you to purchase an S-Builder Co-op unit at this time.
Which one is best for you will be determined by your ability and willingness to invest money in an S-Builder Co-op unit and whether you want all the referrals or are willing to share them in order to reduce your outlay.
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If you buy an S-Builder Co-op unit you can pay full price and reap all the referrals, or you can co-op the co-op and let your CSAs and PSAs split the cost and you split the referrals with them. This gives you a certain measure of control over the division of cost and benefits. (I recently bought an S-Builder Co-op unit and shared it with two people as a thank you. I paid the full price, but share the referrals. It is a reasonably priced way to do something for someone else.)