Paypal button for shipping I think it can charge on where its going - , do not refund shipping is the easiest solution - perhaps combine the order but don't refund the extra cost for the buyer. That is time out of your busy day. The extra cost can go to the "you create dahlias everyone wants to grow"
Further I have advocated you charge minimum $40 for new intros. If Swan Island charges then why not you? The highly sought after ones (such a HH black cherry , HH moonsong) and tuber count adjust accordingly. Say $20 / $25.
I do like the look of that pink one on the left. Also do you still HH Bashful? I do not know any other seller that has it. Thanks figured I would ask.