What type of adapter are you asking about? If you are asking for a wireless adapter for the BDPS1100, there is not one available for this player. This is an entry level model that does not have wireless support.
Funny how when I check the Marketing Specifications page 4 the first thing I see is
"1. Broadband speed of at least 2.5 Mbps recommended (10 Mbps for HD). Content subject to change and may require fees. Wireless connectivity require an 802.11 home network."
Now why would wireless connectivity requirements be listed if it is not wireless capable? If you take a look at many of the reviews of this product, people repeatedly are assuming this is wifi capable. Apparently Sony does not want to take responsibility.
Let's work on READING our marketing materials before you dismiss a customer next time.
And yes I realize that these are footnotes, but they are footnotes that don't reference anything so people usually arent going to realize that. On Amazon, (from the manufacturer) they are just listed, not as footnotes, but just numbers in the description which is how my brother made the same mistake.