I'd add to Lillian's advice and say - local 'farm' vets, free local listings paper, on-line forums (here, RC, the pig site etc) they should be on the BPA database too, so you might get a bit of interest there. Local shops are a good idea too and if you've got a livestock market that holds pig sales, get along to one and talk to folk, tell them you have weaners and spread the word
Another thing which might be worth considering is if there's a community council website for your area - get in touch with them and ask to be included. The RBST will advertise them free if you're a member, if not there's a small charge. Also practical pig keeping (is that the name ?) the new BPA magazine - you can pay to advertise in there too. Pre-loved is another site where there are pigs advertised (not sure of the costs though)
HTH
Karen x
PS. How are they all doing ? and how are Kim and Aggie now ?