Used or new, Ultegra or lower:
brake calipers (cheap ones are fine)
10spd shifters
10spd cassette
10spd dérailleur
seat post
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PM sent
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I have a couple of Shimano 105 10-speed cassettes available. These two are in very good condition because there were take offs.
I also have a 27.2mm Deda Blackstick seatpost that is used, but with plenty of life to go.
i have a cervelo mach2 brakeset, new, black $55 shipped
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I have a used 105 front derailleur, clamp on, 31.8mm, in decent condition, plenty of life left in it! Pics on request, will give it to you for $15 shipped.