For cheap chips, I use #000 bubble mailers which I buy in bulk on eBay (25¢-30¢ each in lots of 100) and I use the "California Dogface Butterfly non-machinable surcharge" stamp which costs 70¢ each and comes in sheets of 20 from the post office. I can mail one or sometimes two chips, depending on their composition, for right around $1.05 without tracking. Also, when I mail it, I do not take it to the counter at the post office, I drop it off in the curbside drop box outside in the parking lot. If you take it to the counter, you might run into the wrong postal employee that gets their little mail checker with the slot to see how thick it is. Again, there is no tracking so I don't do it with expensive chips but I'm willing to roll the dice with cheap ones. Cheers!