Kathmandu has a 'Buy 1 get 2 Free' offer for their KMDMotion Mens/Womens range (excludes clearance). Not as cheap as previous deal but still pretty good. You can mix and match between different styles to get the offer. The final price will only be shown once you proceed to checkout.
Looks like you can also get them at $23.33 each from their eBay store
I've personally found these Kathmandu thermals to be really warm (warmer than Uniqlo Heattech) even though they are pricier. The KMDMotion range is also better quality, has more size options and better fit compared to the cheaper KMDCore range which is unisex.