While IBM is still providing support for SNA, one of the primary pieces of hardware, the 3745/3746 communications controller, has been withdrawn from the market by IBM.
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Since the launch of SNA IBM has introduced improved communications processors, of which the latest is the 3745.
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And SNA IBM 3745 Communications Controllers typically cost over $100K.
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With the models mentioned, APPC support was added, using LU6.2 based on SNA PU2.1.
Roughly speaking, tunneling protocols operate at the transport layer, such as carrying non-IP protocols such as IBM's SNA or Novell's IPX over an IP network, or end-to-end encryption with IPsec.