I would call some linen stores in your local area. I would think after they have been used for different catering events they'd off load some. also, check w/ restaurants to find out if they have any you could purchase at a discount price pr of they can recommend a business they deal with. :)
I don't know where you live, but I think some cities have restaurant supply houses; don't know whether they sell them used.
Also, you could probably rent them.
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