[Timesink]

You can buy Monopoly money online without buying an entire Monopoly game. A full set is only $2.98. Click here to buy. (Unfortunately, shipping is $4.95. Maybe we should pool.)

Let's have a Mail Freep!

[Notwithstanding]

They sell play money at many dollar stores (no pun intended).

[jrewingjr]

I found some at Wal-mart recently too, right next to the complete game. I'm mailing several envelopes tomorrow at different boxes so they will receive different postmarks.