I've seen it mentioned in a thread, but I don't know if anyone has posted a thread just to tell everyone that Math Mammoth is on sale through a Homeschool Buyers Co-op group buy. The level of discount is up to 40%. Right now it's at 20%, but they only need 50 buyers to reach the 40% discount. The sale ends March 31st, and you can commit to buy at 20, 30, or 40% off, so if you're uncomfortable at the lower discount, you can hold out. Just know that if it doesn't reach your chosen discount, you won't get the product. HSBC is free to join, and they have tons of great group buys.
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*Disclaimer: I do have a vested interest in people joining in on this group buy, because I'm in on the group buy and would like to get the lowest discount. lol
