FTDNA has released a Z156 SNP Pack, initially for $99 (presumably going up to $119 within a week or two). Z156 is also known as S264 on YFull's haplotree.
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Includes the following SNPs on the haplotree:
P310, U106, Z381, L48, Z9, L47, Z156, P89, L1, Z18, L127, Z8, Z306, Z326, Z301

Includes the following SNPs that are NOT on the haplotree:
A7173, BY3238, A7213, BY3239, A7197, BY3240, BY3241, BY3242, BY3243, BY3244, BY3245, BY3246, A226, A317, A7172, A7208, A7174, A7207, A7206, BY3237, ZS1981, Z4303, A410, A415, A5396, A6535, A671, A680, A685, A7108, A955, BY650, CTS7550, DF98, FGC11661, FGC11662, FGC11672, FGC11674, FGC12359, FGC13167, FGC13171, FGC13314, FGC13324, Z304, YFS15487, S9397, S8350, S6961, S5556, L6, M6509, M8963, FGC13326, FGC13445, FGC13446, FGC13595, FGC13609, FGC14326, FGC14758, S5520, S5512, S4004, S3311, S25234, FGC14776, FGC14814, FGC14840, FGC15238, FGC15239, FGC17500, FGC22502, FGC23205, FGC23212, S19552, S22047, S22069, S23139, FGC8383, FGC13602, PH589, S1894, S1903, S1911, S10185, S10621, S11477, S11515, S11739, S12647, S15663, S16265, S1791, S1794, S18823

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