Does anyone have a reliable source for paper bags.

I would like to harvest my Allium seeds, and I understand the
recognised method is to shroud the Alluim head in a paper bag and
catch the seeds as they ripen and fall.

Sainsbury, Safeway and Somerfield do not have any paper bags, the
green grocers stall in Whitecross Street market has gone over to
polythene too.

Can anyone suggest anyother ideas. I have to admit being tempted to
fabicate something from a couple of sheets of A4 paper. Maybe if the
price of oil keeps rising we will eventuially see an end to plastic
bags. Surely brown paper bags would be a good use for re-cycled
paper.

Phil