Standard price is USD$39.95 per 12 months, but a PIA rep sent me the link to the 'retention' page which does not require you to have had a previous account, nor does it appear to have an expiry date. No codes or coupons - the price should simply come up as USD $31.95.
Not as good as the $29.99 deal they have every so often, and some of the more privacy paranoid might have issues with the company being US-based (see the following page for alternatives if that's the case), but for the price it's fast, has great customer support and is definitely excellent value.
Do you know whether it will tack onto the end of an existing account?