I just weighed 10 old slot machine tokens from about 1980 on a digital scale -- weight even 8 ounces. So the cheapest way to send would be a first class PARCEL package, which can be no more than 13 ounces. 13 ounce mailpiece comes to $3.41.

My handy charts show you the number of 44 and 20-cent stamps you can put on the mailpiece:
http://www.antiquegamblingchips.com/USPostageApril2011.htm

Robert