Alice,
It goes on sale pretty regularly, so keep watching the circulars. Also, the manager of the HF near me said that if a sale price is printed in the glossy mailer that HF sends out, then the store will honor that price. If the price is in one of the newspaper-like mailers, then the store may not honor the price because those are regional or local prices (of course, the WILL honor the price in the newspaper-like mailer(s) that cover their store).
Hope this helps!
Oh, and for anyone else looking, there are several threads, including:
http://www.penturners.org/forum/topic.asp?TOPIC_ID=15883&SearchTerms=paint,pot
http://www.penturners.org/forum/topic.asp?TOPIC_ID=11891&SearchTerms=paint,pot
http://www.penturners.org/forum/topic.asp?TOPIC_ID=15945&SearchTerms=pressure,pot
http://www.penturners.org/forum/topic.asp?TOPIC_ID=15385&SearchTerms=pressure,pot
http://www.penturners.org/forum/topic.asp?TOPIC_ID=12429&SearchTerms=pressure,pot
http://www.penturners.org/forum/topic.asp?TOPIC_ID=12366&SearchTerms=pressure,pot
http://www.penturners.org/forum/topic.asp?TOPIC_ID=12582&SearchTerms=pressure,pot
http://www.penturners.org/forum/topic.asp?TOPIC_ID=11703&SearchTerms=paint,pot