I bought the Park on sale for $40, IIRC. Paid for itself within a year, at the rate I'd been paying $20 for each spoke replaced at my LBS with truing.

As [MENTION=194136]zandoval[/MENTION] notes, you can get a knock-off from Amazon for much less than the Park. If you get one, please do report back after a couple of years! Note, the geometry is different from the Park but the measurement process looks to be identical.

(Had an intense "ME WANT IT" response to FB's offer. Wrestling that down with "do I really need it?" and "where would I put it?" has been difficult!)