Stamps (yes stamps are expensive, but I'm sure there's some way to find them cheaper, *cough cough* etsy and facebook marketplace *cough cough*) I usually buy these at Sam's Club for $15 for 500)
#10 envelopes (blank, preferably with seals so that you won't have to lick a thousand envelopes. 4圆in blank notecards (unfolded, unlined, and yes, blank. I'm assuming that you have created an account and linked your bank account at this point. This post will give you a step-by-step guide on how to write Sweeps Coins letters in the easiest way possible.
