Halfway through their upgrade cycle, assuming Redmond intends to follow a classic one-year release schedule, the convertible Surface Pro 4 and Surface Book apparently need a little sales boost in order to return to the spotlight.

Already, we’ve seen the cheaper 2-in-1 Windows 10 machine discounted by $100 in Intel Core i5 configurations, while the “ultimate laptop” was literally just treated to similar rebates when packing the same processor.

If you felt Microsoft could do better however and postponed your purchase awaiting heftier savings, these have now arrived, unfortunately only lasting through tomorrow, April 9.

In both on and offline manufacturer stores stateside, the Core i7/256GB SSD/8GB RAM Surface Book model with a dedicated, discrete NVIDIA GPU costs $1,950, down from the $2,100 MSRP. Meanwhile, an i7/256GB/8GB Surface Pro 4 version featuring integrated graphics sets you back $1,450, which represents a cool $150 reduction compared to the typical list price.

Finally, the slightly lower-end Core i5/256GB/8GB Surface Pro 4 config that was recently trimmed by $100 ups the discount ante to $150, as it’s now priced at $1,150 instead of $1,300.

The icing on the cake, at least as far as the marked-down Surface Book is concerned? You can combine the $150 savings with a Surface Dock deal taking $100 off the accessory, or a free Xbox Controller and Wireless Adapter for Windows, normally valued at $80. Just remember there’s not a lot of time to hesitate.

Sources: Microsoft Store (1), (2)