Attempted with either of the 20 in. x 25 in. x 5 in. options that are listed as being part of the promotion but it only gives a 10% multi-pack discount, not a buy-2-get-2-free. Anyone else have success?
I think the trick is to order 4 same-sized filter to get the discount. I ordered four HDX NO. 7 20x30x1 & four HDX NO. 7 20x25x1 filters and the total was $60 or $7.50/pc.
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Thank you!