I've made contact with a couple of websites that sell the Fumoto oil drain valve about a possible group buy. So far the only one I've heard back from is http://www.quickoildrainvalve.com/. They said they will offer 10% off for 5, and 15% off if we reach 30. I wanted to see what kind of interest there was here before I pressed for further discounts or tried for free shipping. The regular price is 23.95 for the model without the nipple, and 26.95 for the model with the nipple. 15% discount would bring it down to 20.36 and 22.91. When I calculated shipping to Louisiana it was $5 for the first one and $1 extra for each additional.
Updated with offers below:
Offer 1: contact firstname.lastname@example.org and let him know you are part of the tacoma world group buy. His price is $24 for the regular valves, and $26 for the valves with the nipple. This price includes shipping and a 6 month trial AMSOIL Preferred Customer membership ($10 value). For members that want more than 1 valve he will take $1 off each additional valve. Shipping to Canada will be $1.70 extra.
Offer 2: www.qwikvalve.com 10% off with promo code tacoma10. They offer free shipping if you purchase more than 1 valve. ($21.56 regular valve & $24.26 w/nipple). Limited to 1 coupon code per individual, and 100 max customers and expires on May 18. You will need to register for an account before the code will work.
Offer 3: http://www.quickoildrainvalve.com 15% off with promo code TAC4. They charge shipping on all orders and did not mention any time or order limits. ($20.36 regular valve & $22.91 w/nipple)
Depending on where you live, shipping charges and the possibility of tax being added will determine which offer is best for you. Let me know if you have any questions.