McLovin is right, pots cost a fortune to post.
I may have some free by the end of Sunday 18 Aug 13 if you train at the CPPS.
Locklids are wider then other pots, due to the fact they have dimples (which makes them harder to pull out of most packs anyway!) and their general girthage is thicker too. You may be able to find people who may be keen to just trade your locklids for normal pots.