Integrated Seat Post Topper

[mhk1058]

Anyone know of a decent ISP topper readily available?

I'm looking for one like this one:

http://www.fullspeedahead.com/products/road/sl-k-integrated-seatpost/

or this one:

http://www.rczbikeshop.com/en_ue/frm-seatpost-st-11-e-31-6-black.html

rather than the type that fit over the tube. Seems there are very few about and can't find anybody actually stocking either of the ones above.

Thanks