I ordered some from these chaps yesterday evening; cheapest I've seen them and P&P reasonable
http://nmpgroup.net/marksman-22-air-...3428_3644.html
Tins, boxes, round & pointed. Also .177s
Prefer the boxes myself from a nostalgia point
Single 500 box .22 round are £3.95
Interesting link to the modern Lincoln Jeffries pellet site http://www.marksmanpellets.com