This one is back on sale, although not as good as the Black Friday sale. For $52.95 its cheaper than buying a new set of blades of an older version, so I jumped on it.
The other models also are on sale, but not sure if they're worth the premium over this basic one:
Philips OneBlade 360 Face PRO Hybrid Electric Beard and Hair Trimmer, Shaver for Head with 12 Length Precision Comb, QP6532/15 @ $93.00 (33% off)
Philips OneBlade 360 Face+Body PRO Hybrid Electric Beard and Hair Trimmer, Shaver for head with 20 Length Precision Comb, 2 Blades, QP6552/15 @ $124.95 (34% off)



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Obligatory warning: the blades are disposable. Do not expect to be using one blade for a long long time like a regular trimmer.