hi John Poitiers
i searched around for the 3rd party grip after i read posts from other Pentaxians here or there, especially on this forum. sorry can't remember which thread it was on but i think you can find that one (if it's still there) by doing a search yourself here on the forum's main page perhaps ...
i also made another search online with many links, here:
pentax K-7 battery grip 3rd party - Bing
for what i remember, there were three of these 3rd party grips, with one being the worst of them due to certain reasons ... they were all priced around $50 back then as far as i can remember, which makes it 1/4 the price for an original Pentax grip btw ...
unfortunately, even the original Pentax grip's locking handle doesn't seem very strong although it's served well for me so far after nearly two years of use, which is one year longer (thus stronger!) than the 3rd party grip ...
B&H also has one such clone battery grip (link below) at a higher price than the other 3rd party grips albeit still much less costly than the original one, but i have no idea if it's better than the broken one i have already or not?
D-BG4 Battery Grip for Pentax K-7 & K-5 bower
hope this helps ...