Hi
Try free ads, friday-ads, local tack shops and pet shops or ask at the nearest dog rehoming centre if they know of any one who is looking for some labs. Good luck.
Please don't use a free website
As I said in the dog forum, and as another user advised, there are shysters on those sites who may pick up your two free bitches, sell them on for a huge fee or breed from them, even at their age, please be very careful and do not fall for a scam - look at this, from Gumtree:
dog pages are good www.dogpages.org.uk there is a private rehoming section there or some of the charitys may be willing to find a suitable home or arranged a home check for you. Hope that helps