Is sniffing with a smog probe as good/better test?
If so, you could save quite a few bucks.

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>
> Date:    Fri, 8 Mar 2002 16:10:44 EST
> From:    Frank Grunthaner <FrankGRUN@AOL.COM>
> Subject: For WBX Owners with Suspected Head Leaks
>
> For those of you who suspect leaking heads but are desperately clinging to
> the vagrant air bubble hope, Eastwood has an inexpensive cooling system test
> kit that will detect exhaust gases in the coolant. It is simple and easy to
> use. Their price is $44.99 and shipping.