The cheapest source we found for Hi Viz vests were these guys:
http://www.hivis.net/
We just had 500 4x4 Response stickers printed <£110 inc vat. We split them with the Herefordshire Group. We give a couple to each new member with a hi viz and a few other goodies. Let me know if you want a sample or details of the supplier - based in Wrexham I think but we could get them done and get them across to you if you wanted.
