In my opinion, they are inexpensive.
http://www.nautiqueparts.com/ballasttankfillpump.aspx
Planetnautique.com has a 10% discount code.
That said, on my old 99 Air I filled and drained without the pumps for 3 years before I ripped the system out and replaced with an impeller pump - Fly High Pro bag system.
You may need to change your name WiscoWakeseter if your piloting a Nautique now. Where in Wisconsin are you located?