I guess not everyone knew about these so here goes links to some web sites:
Hardrock-50 50W PA loosely based on and improved version of ARRL 50W PA challange entry 2010.
http://www.hobbypcb.com/component/virtuemart/hardrock-50-hf-power-amp-kit-detail?Itemid=119
http://www.eham.net/reviews/detail/10839
The winner for the sub $125 category in that same contest was W6JL and the design is seriously cheap you will find his build has been used in a lot of 100% homebrew builds so not a kit really but should appear in his list. This link is to one of the better sites about it. ARRL members can down load the article.
http://www.carnut.info/W6JL_50W_pa/W6JL_50w_PA.htm
Elecraft KXPA100
The very long time to market 100W PA from Elecrft that is primarily for the KX3
http://www.elecraft.com/elecraft_prod_list.htm#kxpa100
They say built and kit.... the kit is a screwdrver kit, no soldering.
Same site/page and you will find all the other Elecraft goodies. KX3, P3, K3, PX3 (P3 for KX3)
Tentec
http://www.tentec.com/
Flex Radio
http://www.flexradio.com/
Waters and Stanton
www.wsplc.com
Martin Lynch and Sons
http://www.hamradio.co.uk/
QPProject (Germany)
http://qrpproject.de/ then select the English Pages
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