Hey bud, good to see ya hanging around. 
Giveaways/raffles - do em however you want. But @DougDawson has pointed you in the right direction.
As for shipping, yeah coin flips and hose washer haven’t failed me yet. Some have experienced some breakage on occasion. A regular envelope and one forever stamp will work for anything under 1/4" in thickness and 1oz in weight.
@Bobgrows is who you wanna talk to about 3D printed pucks. I think they’re only .15-.25 cents each. Don’t quote me on that, lol. Here’s a link.
Oh yeah, for your auto projects, I’d get hooked up with @LoveDaAutos. I bet the two of y’all would have some fun exchanges. 
Gonna throw in this pic I found while getting you that link about pucks. This awsome picture is both fun and sad at the same time. I hope it can bring a smile to some faces. RIP @DJSF
