the smallest priority box is 6.80 and you can probably put 8 in there depending on the length. Name your price, only you know how much time it takes to crank them out. I'm sure now that you have a system it's gonna get easier.
Here's what I'm thinking
it took about an hour, you're retired and it's tax free=$30 per hour
materials-pvc, oil, machine use, electric=$30
65/15=$4
so 4 bux and we pay shipping and everyone has to send you seeds since you helped them grow.