To be honest, I think I just searched on Ebay for them & bought them off there.
Yes, I've just had a look & there's loads of them from about £4 to £60 (!!!) These look nice:
http://www.ebay.co.uk/itm/Brass-Abalone-premium-bridge-pin-set-for-acoustic-guitars-string-pegs-pins-/112246013074?hash=item1a22623c92:g:S7YAAOSw5cNYXSDl
G.