Yep... I've posted that one a few times. I've seen it as low as $9 !!! That's the pump I use in my Islandia, and it was so cheap... I bought a second one to keep as a backup.
The factory pump in the Islandia is a little different. It's 40 PSI and more volume. BUT... you can take the little square cover off, and turn the center screw out, and it will lower the pressure. In turn... the volume goes up.
The other thing is the OEM pump has quick fittings, and that one has threaded fittings. But... it's not a big deal. It cost about $10 at the hardware store to get some barbed fittings.